小学数学简便运算专项练习238题(有答案)
1.(0.86+0.86+0.86+0.86)×25
2. 4÷1+6×
3. 125÷(50÷8)
4. 7.6×÷[1.9﹣1.9×(1.9﹣1.9)].
5.999×999﹣2×999+1.
6.1.25×0.25×0.05×64
7. 20.06×65+380×2.006﹣2.006×30.
8. (﹣÷4×)÷
9. ×23
10. 38﹣15.38+61.25﹣3.62
11. 17.98+2.5×0.3﹣18÷1.5
12. ×+×
13.(+)÷.
14.
15.
16.
.
18. 22.7×1.25×0.8
19. 3.91×2.8+6.09×2.8.
20. 23.4×16﹣23.4×6
21. 20﹣5.75﹣14.25
22. 1.25×0.25×32
23. 56×(﹣+)
24.0.279×258+0.742×279
25. 13÷28+11÷27+15÷28+38÷27.
26. (+)×24×15
27. 3.7×+5.3×0.75+.
28. 9.9+99.9+999.9
29. 6.8÷4﹣1.2×25%+4×0.25.
30. 6.3+6.44+2.7+3.56
31. 15.35﹣(5.35+7.2)
32. 600÷12
33. 67×102.
34.
35.
36.
37. .
38. 1.3﹣3.79+9.7﹣6.21
39. 3.64÷4+4.36×0.25
40. ÷(﹣)×(﹣)
41. 9×4.25+4×
42. (﹣)×4×9
43. 1+2+3+4+…+49+50.
44. 4.8×0.25
45. 2.33×0.5×4
46. 1.2×2.5+0.8×2.5
47. 3.7÷1.25÷8.
48. 43.6+9.8+6.4
49. 17.3×0.25×8
50. 2.31×1.5+1.5×7.69.
51. 10.24﹣6.67﹣1.33
52. 32000÷125÷8
53. 7.31+15.05+2.69+4.95
54. 47×101
55.573﹣298
56. 194+501
57. 627﹣(427+189)
58. 630÷14
59. 125×25×32
60. 210÷6÷5.
61.125×32
62. 640÷5÷8
63. 653﹣98
64. 944+102.
65.25×79×4
66. 8×166×25
67. 50×25×4×3
68. 8×(25×15)
69. (250×72)×4
70. 5×25×13×40×20.
71. 7350÷25
72. 54×101
73. 227+364+146+173
74. 5604﹣(723+1604)
75. ×1.67+0.33×
76. 999×667+667.
77. 2004×
78. 81﹣(3.81﹣1.65)+2.25
79. 24×(﹣+).
80. (+)×24
81. +×
82. 2.5×3.2×1.25
83. 4.05﹣(2.05+)
84. 5.39++4.61+
85.0.588×+4×9.412+×0.588.
86.45×98+45×2
87. 452﹣(152+240)
88. 99×27
89. 1120÷16÷7
90. 113×36﹣13×36
91. 179﹣245+321﹣155.
92.1.24+14.95+8.76﹣4.95
93. 52.7﹣5.27﹣2.7
94. 35×201
95. 4500÷25÷4
96. 125×32
97. 654××99+346×99.
98. 56×12.5
99. 14.6﹣(4.6+7.2)
100. 99×99+199.
101.0.125×0.25×8×4
102. 1927﹣528﹣472.
103. (++)×105
104. ×+25%×+0.25×
105. 2+3﹣3+1+1
106. 3.7×99+3.7
107. 1.2×2.5+2.8×2.5
108. 4.8×2.5.
109. 4.05﹣2.86﹣0.14
110. 7×+0.4×7
111. 2.25×3.14×4+3.14
112. (﹣)×17×15.
113. 6.3×8.7+8.7×3.7
(﹣+)×12
115. ×+÷.
116. 7.25﹣3+3.75﹣6
117. 49×(+)×25
118. ×+÷﹣.
119. ﹣+
120. ×12.5×8×0.4
121. ×12.
122. 25×0.32×1.25
123. 0.37×79+3.7×2.1
124. 2011÷2011+
125. ++++
126. (﹣)×12
127. 1000+999×999.
178.4﹣45.3﹣54.7
129. 456﹣(256﹣144)
130. 102×45
131. 32×125×25
132. 43×99+43
133. (40+8)×25
134. 73×99
135. 54×11﹣54.
136. 301×79
137. 125×72×4
138. 728×79十272×79
139. 8.59+2.57+3.43+5.47
140. 49.62+27.17﹣19.62
141. 1546﹣(546﹣239)
142. .
143.1999+999×999.
4.37×6.3+4.37×3.7
145. 2.64÷1.25÷0.8
146. 10.2×0.45.
147. 3.5%×9.9
148. 1+3+5+7+9
149. 2008×20072008﹣2006×20082007.
150. 24.87﹣0.53﹣1.47
151. 50×
152. 0.375×.
7.5+2.7+2.7+2.5+4.3
7.9﹣3.27﹣0.73+1.1
155. 72×125
(80+4)×125
67×88+67×11+67
158. 203×15.
159. 4392﹣2997
160. 2.5×32×1.25
161. ×+÷
162. 13×+
163. 9÷[(20.75﹣9.5)]×0.4]
164. ÷﹣×.
165. 1.25×32×2.5
166. 4×3.5+4.8×7﹣480%
167.(5﹣1.8)÷[(1.15+)×1]
168. 3333×224+6666×368.
169. 395﹣283+154+246﹣117
170. 8795﹣4998+2994﹣3002﹣2008
1999+999×999
172. 38×25×6.
173. 2.06×101
174. 0.25×125×0.32
175. 1.25×8.8
176. 31.8×2.5+31.8×7.5.
19×8×125
178. 38+129+71
179. 1756﹣398
180. 406×201
181. 16×125
182. 1900÷4÷25.
8.35+3.8﹣2.35
184. 15.4﹣(5.4+2.3)
185. 98×45
186. 16×125×25
187. 12×69﹣69×2
188. (20+8)×25.
189. 9+99+999+9999+99999;
190. 1﹣2+3﹣4+5﹣6+…﹣1992+1993.
36×11;
192. 246×11.
193. 678+(354+322)
194. 283+147+17+1653
195. 384﹣(37+184)
196. 2904﹣1327﹣173
197. 653﹣197
198. 125×17﹣125
199. 235×99
200. (1300﹣520)÷13
201. 67×21+18×21+85×79
202. 222222×999999.
203. 18×+2
204. ×﹣.
205. 0.8×7.3﹣63×20.08
206. 65.5﹣4.29+24.6﹣5.71
207. 1991+1989+2000+1995+2011+2005+1998+1993.
208. 99999×22222+33333×33334
209. 2003×2004÷2004×2004﹣2003×2004
210. 2.8×(+)
211. 101×
212. 9.81×10%+0.5×98.1+0.049×981
213. 23×+14×.
214. 38.4×187﹣15.4×384+3.3×16=
215. 3﹣(0.16+1)﹣1.84
216. 2009÷2009
217. 9+99+999+9999﹣
218. 4.03÷12.5.
219. 1997+1998+1999+2001
220. 3425﹣188﹣212﹣25
221. 567×999+567×2
222.( 91×48×75 )÷( 25×13×16)
×3+×5+×10
224. 999×7+111×7
225. 97×
226. (+++)×2002
227. 8.5×+0.75×5+6.5÷1
228. ++++.
229. 1.25×1.25×32
230. 15×(+)×17.
231. 25×99+25
232. 75×75+75×25
233. 64×125
234. 17+64+83+36
235. 1200﹣128﹣72
236. 3000÷125÷8.
237..65×8.7+6.5×0.23﹣0.65
238. .
答案:
1.(0.86+0.86+0.86+0.86)×25,
=0.86×(4×25),
=0.86×100,
=86;
2. 4÷1+6×,
=(4+6)×,
=10×,
=6;
3. 125÷(50÷8),
=125×8÷50,
=1000÷50,
=20;
4. 7.6×÷[1.9﹣1.9×(1.9﹣1.9)],
=7.6×÷[1.9﹣1.9×0],
=7.6×÷1.9,
=7.6×,
=2
5.999×999﹣2×999+1,
=(1000﹣1)×(999﹣2)+1,
=(1000﹣1)×997+1,
=1000×997﹣1×997+1,
=997000﹣997+1,
=996004
6.1.25×0.25×0.05×64,
=1.25×0.25×0.05×(8×4×2),
=(1.25×8)×(0.25×4)×(0.05×2),
=10×1×0.1,
=1;
7. 20.06×65+380×2.006﹣2.006×30,
=20.06×65+(380﹣30)×2.006,
=20.06×65+350×2.006,
=20.06×65+(350÷10)×(2.006×10),
=20.06×65+35×20.06,
=20.06×(65+35),
=20.06×100,
=2006
8. (﹣÷4×)÷,
=()÷,
=()×2,
=2,
=;
9. ×23,
=(24﹣1),
=24,
=23,
=;
10. 38﹣15.38+61.25﹣3.62,
=38.75+61.25﹣(15.38+3.62),
=100﹣19,
=81;
11. 17.98+2.5×0.3﹣18÷1.5,
=17.98+0.75﹣12,
=18.73﹣12,
=6.73;
12. ×+×,
=()×,
=1×,
=;
13.(+)÷.
=,
=2+1,
=3
14. ,
=4.76+5.24+5,
=10+5,
=15,
15. ,
=3﹣0.16﹣1﹣1.84,
=(3﹣1)﹣(0.16+1.84),
=2﹣2,
=0;
16. ,
=2.8﹣[0.43+(+1)],
=2.8﹣[0.43+2],
=2.8﹣2.43,
=0.37;
17. ,
=9.56﹣(3+2),
=9.56﹣6,
=3.56
18. 22.7×1.25×0.8,
=22.7×(1.25×0.8),
=22.7×1,
=22.7;
19. 3.91×2.8+6.09×2.8,
=(3.91+6.09)×2.8,
=10×2.8,
=28
20. 23.4×16﹣23.4×6,
=(16﹣6)×23.4,
=10×23.4,
=234;
21. 20﹣5.75﹣14.25,
=20﹣(5.75+14.25),
=20﹣20,
=;
22. 1.25×0.25×32,
=1.25×0.25×8×4,
=1.25×8×(0.25×4),
=10×1,
=10;
23. 56×(﹣+),
=56×﹣56×+56×,
=24﹣21+2,
=5
24. 0.279×258+0.742×279,
=279×0.258+0.742×289,
=279×(0.258+0.742),
=279×1,
=279;
25. 13÷28+11÷27+15÷28+38÷27,
=,
=()+(),
=1+,
=2
26. (+)×24×15,
=,
=150+24,
=174;
27. 3.7×+5.3×0.75+.
=(3.7+5.3+1)×0.75,
=10×0.75,
=7.5;
28. 9.9+99.9+999.9,
=(9.9+0.1)+(99.9+0.1)+(999.9+0.1)﹣0.1×3,
=10+100+1000﹣0.3,
=1110﹣0.3,
=1109.7;
29. 6.8÷4﹣1.2×25%+4×0.25.
=6.8×﹣1.2×+4.4×,
=(6.8﹣1.2+4.4)×,
=10×,
=2.5
30. 6.3+6.44+2.7+3.56,
=(6.3+2.7)+(6.44+3.56),
=9+10,
=19;
31. 15.35﹣(5.35+7.2),
=15.35﹣5.35﹣7.2,
=10﹣7.2,
=2.8;
32. 600÷12,
=600÷(6×2),
=600÷6÷2,
=100÷2,
=50;
33. 67×102,
=67×(100+2),
=67×100+67×2,
=6700+134,
=6834
34. ,
=4.85+5.15﹣(),
=10﹣1,
=9;
35. ,
=(4.75×﹣3.6+6.15×3.6),
=[(4.75+6.15﹣1)×3.6],
=9.9×3.6,
=3.96;
36. ,
=[],
=,
=,
=;
37. .
=(1+3+5+7+9)+()+(),
=25+()+(),
=25++,
=25+(),
=25+,
=25+(),
=25
=.
38. 1.3﹣3.79+9.7﹣6.21,
=(1.3+9.7)﹣(3.79+6.21),
=11﹣10,
=1;
39. 3.64÷4+4.36×0.25,
=3.64×+4.36×,
=(3.64+4.36)×,
=8×,
=2;
40. ÷(﹣)×(﹣),
=÷×,
=×,
=;
41. 9×4.25+4×,
=9×4+4×,
=(9+)×4,
=10×,
=;
42. (﹣)×4×9,
=(﹣)×(4×9),
=(﹣)×36,
=×36﹣×36,
=4﹣3,
=1;
43. 1+2+3+4+…+49+50,
=(1+50)+(2+49)+(3+48)+…+(25+26),
=51+51+51+51+…+51,
=51×25,
=1275
44. 4.8×0.25,
=1.2×(4×0.25),
=1.2×1,
=1.2;
45. 2.33×0.5×4,
=2.33×(0.5×4),
=2.33×2,
=4.66;
46. 1.2×2.5+0.8×2.5,
=(1.2+0.8)×2.5,
=2×2.5,
=5;
47. 3.7÷1.25÷8.
=3.7÷(1.25×8),
=3.7÷10,
=0.37
48. 43.6+9.8+6.4,
=9.8+(43.6+6.4),
=9.8+50,
=59.8;
49. 17.3×0.25×8,
=17.3×(0.25×8),
=17.3×2,
=34.6;
50. 2.31×1.5+1.5×7.69.
=(2.31+7.69)×1.5,
=10×1.5,
=15
51. 10.24﹣6.67﹣1.33,
=10.24﹣(6.67+1.33),
=10.24﹣8,
=2.24;
52. 32000÷125÷8,
=32000÷(125×8),
=32000÷1000,
=32;
53. 7.31+15.05+2.69+4.95,
=(7.31+2.69)+(15.05+4.95),
=10+20,
=30;
54. 47×101,
=47+(100+1),
=47×100+47,
=4700+47,
=4747
55. 573﹣298,
=573﹣300+2,
=275;
56. 194+501,
=194+500+1,
=695;
57. 627﹣(427+189),
=627﹣427﹣189,
=11;
58. 630÷14,
=630÷7÷2,
=90÷2,
=45;
59. 125×25×32,
=(125×8)×(25×4),
=1000×100,
=100000;
60. 210÷6÷5,
=210÷(6×5),
=210÷30,
=7
61. 125×32,
=125×8×4,
=1000×4,
=4000;
62. 640÷5÷8,
=640÷(5×8),
=640÷40,
=16;
63. 653﹣98,
=653﹣100+2,
=453+2,
=455;
64. 944+102,
=944+100+2,
=1044+2,
=1046
65.25×79×4
=25×4×79
=100×79
=7900
66. 8×166×25
=8×25×166
=200×166
=33200
67. 50×25×4×3
=(25×4)×(50×3)
=100×150
=15000
68. 8×(25×15)
=8×25×15
=200×15
=3000
69. (250×72)×4
=250×4×72
=1000×72
=72000
70. 5×25×13×40×20
=(25×40)×(5×20)×13
=1000×100×13
=1300000
71. 7350÷25,
=(7350×4)÷(25×4),
=29400÷100,
=294;
72. 54×101,
=54×100+54,
=5454;
73. 227+364+146+173,
=(227+173)+(364+146),
=400+510,
=910;
74. 5604﹣(723+1604),
=5604﹣1604﹣723,
=3277
75. ×1.67+0.33×,
=×(1.67+0.33),
=×2,
=;
76. 999×667+667×1,
=667×(999+1),
=667×1000,
=667000
77. 2004×,
=(2003+1)×,
=2003×+1×,
=2002+,
=2002;
78. 81﹣(3.81﹣1.65)+2.25,
=81﹣3.81+1.65+2.25,
=(81﹣3.81)+(1.65+2.25),
=77.19+3.9,
=81.09;
79. 24×(﹣+),
=24×﹣24×+24×,
=20﹣6+16,
=14+16,
=30
80. (+)×24,
=×24+×24,
=16+6,
=22;
81. +×,
=×+×,
=(+)×,
=×,
=
82. 2.5×3.2×1.25,
=(2.5×0.4)×(8×1.25),
=1×10,
=10;
83. 4.05﹣(2.05+),
=4.05﹣2.05﹣,
=2﹣,
=1;
84. 5.39++4.61+,
=(5.39+4.61)+(1+),
=10+2,
=12;
85. 0.588×+4×9.412+×0.588,
=0.588×(1+2)+4×9.412,
=0.588×4+4×9.412,
=4×(0.588+9.412),
=4×10,
=40
86. 45×98+45×2,
=45×(98+2),
=45×100,
=4500;
87. 452﹣(152+240),
=452﹣152﹣240,
=60;
88. 99×27,
=(100﹣1)×27,
=2700﹣27,
=2673;
89. 1120÷16÷7,
=1120÷(16×7),
=1120÷112,
=10
90. 113×36﹣13×36,
=36×(113﹣13),
=36×100,
=3600;
91. 179﹣245+321﹣155,
=(179+321)﹣(245+155),
=400﹣400,
=0
92. 1.24+14.95+8.76﹣4.95,
=(1.24+8.76)+(14.95﹣4.95),
=10+10,
=20;
93. 52.7﹣5.27﹣2.7,
=(52.7﹣2.7)﹣5.27,
=50﹣(5+0.27),
=50﹣5﹣0.27,
=45﹣0.27,
=44.73;
94. 35×201,
=35×(200+1),
=35×200+35,
=7000+35,
=7035;
95. 4500÷25÷4,
=4500÷(25×4),
=4500÷100,
=45;
96. 125×32,
=(125×8)×4,
=1000×4,
=4000;
97. 654×99+346×99,
=(654+346)×99,
=1000×99,
=99000
98. 56×12.5,
=7×(8×12.5),
=7×100,
=700;
99. 14.6﹣(4.6+7.2),
=14.6﹣4.6﹣7.2,
=10﹣7.2,
=2.8;
100. 99×99+199,
=99×99+99+100,
=99×(99+1)+100,
=99×100+100,
=9900+100,
=10000
101. 0.125×0.25×8×4,
=(0.125×8)×(0.25×4),
=1×1,
=1;
102. 1927﹣528﹣472,
=1927﹣(528+472),
=1927﹣1000,
=927
103. (++)×105,
=×105+×105+×105,
=35+21+7,
=56+7,
=63;
104. ×+25%×+0.25×,
=×+×+×,
=(++)×,
=×,
=;
105. 2+3﹣3+1+1,
=(2+1﹣3)+(1+3),
=(4﹣3)+5,
=+5,
=5;
106. 3.7×99+3.7,
=3.7×(99+1),
=3.7×100,
=370
107. 1.2×2.5+2.8×2.5,
=(1.2+2.8)×2.5,
=4×2.5,
=10;
108. 4.8×2.5,
=(4×1.2)×2.5,
=(4×2.5)×1.2,
=10×1.2,
=12
109. 4.05﹣2.86﹣0.14,
=4.05﹣(2.86+0.14),
=4.05﹣3,
=1.05;
110. +0.4×,
=(0.6+0.4),
=×1,
=;
111. 2.25×3.14×4+3.14,
=2.25×4×3.14+3.14,
=9×3.14+3.14,
=(9+1)×3.14,
=10×3.14,
=31.4;
112. (﹣)×17×15,
=×15×17﹣17×15,
=17﹣5,
=12
113.6.3×8.7+8.7×3.7
=(6.3+3.7)×8.7
=10×8.7
=87;
114. (﹣+)×12
=×12﹣×12+×12
=4﹣2+3
=5;
115. ×+÷.
=×+×
=( +)×
=2×
=1
116. 7.25﹣3+3.75﹣6,
=(7.25+3.75)﹣(3+6),
=11﹣9,
=2.
117. 49×(+)×25,
=49××25,
=595;
118. ,
=×+×﹣,
=()×,
=×,
=
119. ﹣+,
=,
=1,
=;
120. ×12.5×8×0.4,
=()×(12.5×0.4),
=2×5,
=10;
121. ×12,
=(24×)×12,
=(9﹣4)×12,
=5×12,
=60
122. 25×0.32×1.25,
=25×0.4×0.8×1.25,
=(25×0.4)×(0.8×1.25),
=10×1,
=10;
123. 0.37×79+3.7×2.1,
=3.7×7.9+3.7×2.1,
=3.7×(7.9+2.1),
=3.7×10,
=37;
124. 2011÷2011+,
=2011÷+,
=2011×+,
=2001×,
=+,
=1;
125. ++++,
=1﹣+﹣+﹣+﹣+﹣,
=1﹣,
=;
126. (﹣)×12,
=×12﹣×12,
=7﹣6,
=1;
127. 1000+999×999,
=1000+999×(1000﹣1),
=1000+999×1000﹣999×1,
=1000+999000﹣999,
=1000000﹣999,
=999001
128. 178.4﹣45.3﹣54.7,
=178.4﹣(45.3+54.7),
=178.4﹣100,
=78.4;
129. 456﹣(256﹣144),
=456﹣256﹣144,
=200﹣144,
=56;
130. 102×45,
=100×45+2×45,
=4500+90,
=4590;
131. 32×125×25,
=(8×125)×(4×25),
=1000×100,
=100000;
132. 43×99+43,
=(99+1)×43,
=100×43,
=4300;
133. (40+8)×25,
=40×25+8×25,
=1000+200,
=1200;
134. 73×99,
=73×100﹣73×1,
=7300﹣73,
=7227;
135. 54×11﹣54,
=(11﹣1)×54,
=10×54,
=540
136. 301×79,
=(300+1)×79,
=300×79+1×79,
=23700+79,
=23779;
137. 125×72×4,
=(125×4)×72,
=500×72,
=36000;
138. 728×79十272×79,
=79×(728+272),
=79×1000,
=79000;
139. 8.59+2.57+3.43+5.47,
=8.59+(2.57+3.43)+5.47,
=8.59+6+5.47,
=20.06;
140. 49.62+27.17﹣19.62,
=49.62﹣19.62+27.17,
=30+27.17,
=57.17;
141. 1546﹣(546﹣239),
=1546﹣546+239,
=1000+239,
=1239
142.×+×+×+×,
=(+++)×,
=(+++)×,
=×,
=
143.1999+999×999,
=(1000﹣1)×999+1999,
=999000﹣999+1999,
=999000+1000,=1000000
144. 4.37×6.3+4.37×3.7,
=4.37×(6.3+3.7),
=4.37×10,
=43.7;
145. 2.64÷1.25÷0.8,
=2.64÷(1.25×0.8),
=2.64÷1,
=2.64;
146. 10.2×0.45,
=(10+2)×0.45,
=10×0.45+2×0.45,
=4.5+0.9,
=5.4.
147. 3.5%×9.9,
=0.035×(10﹣0.1),
=0.035×10﹣0.035×0.1,
=0.35﹣0.0035,
=0.3465;
148. 1+3+5+7+9,
=1++3++5++7++9+,
=(1+3+5+7+9)+(++++),
=25+(1﹣+﹣+﹣+﹣+﹣),
=25+(1﹣),
=25+,
=25;
149. 2008×20072008﹣2006×20082007,
=2008×(2007×10000+2007+1)﹣2006×(2008×10000+2007),
=2008×2007×10000+2007×2008+2008﹣2006×2008×10000﹣2006×2007,
=2008×10000+2×2007+2008,
=20080000+4014+2008,
=20086022
150. 24.87﹣0.53﹣1.47,
=24.87﹣(0.53+1.47),
=24.87﹣2,
=22.87;
151. 50×,
=50×,
=15+20﹣12,
=35﹣12,
=23;
152. 0.375×,
=×+﹣,
=(+1﹣)×,
=8×,
=3
153. 7.5+2.7+2.7+2.5+4.3
=(7.5+2.5)+(2.7+4.3)+2.7,
=10+7+2.7,
=19.7;
154. 7.9﹣3.27﹣0.73+1.1
=7.9+1.1﹣(3.27+0.73),
=9﹣4,
=5;
155. 72×125
=9×8×125,
=9×(8×125),
=9×1000,
=9000;
156. (80+4)×125
=80×125+4×125,
=10000+500,
=10500;
157. 67×88+67×11+67
=(88+11+1)×67,
=100×67,
=6700.
158. 203×15
=(200+3)×15,
=200×15+3×15,
=3000+45,
=3045
159. 4392﹣2997,
=4392﹣3000+3,
=1392+3,
=1395;
160. 2.5×32×1.25,
=(2.5×4)×(8×1.25),
=10×10,
=100;
161. ×+÷,
=()×,
=1×,
=;
162. 13×+,
=(13+1)×,
=14×,
=6;
163. 9÷[(20.75﹣9.5)]×0.4],
=9÷[11.25×0.4],
=9÷[(10+1.25)×0.4],
=9÷[10×0.4+1.25×0.4],
=9÷[4+0.5],
=9÷4.5,
=2;
164. ÷﹣×,
=﹣×,
=×(1﹣),
=×,
=0.3
165. 1.25×32×2.5,
=(1.25×8)×(4×2.5),
=10×10,
=100;
166. 4×3.5+4.8×7﹣480%,
=4.8×3.5+4.8×7.5﹣4.8×1,
=4.8×(3.5+7.5﹣1),
=4.8×10,
=48;
167. (5﹣1.8)÷[(1.15+)×1],
=(5﹣1)÷[(1+)×],
=÷[×],
=÷3,
=;
168. 3333×224+6666×368,
=3333×224+3333×2×368,
=3333×(224+736),
=3333×960,
=3199680
169. 395﹣283+154+246﹣117
=395+(154+246)﹣(283+117)
=395+400﹣400
=395;
171. 8795﹣4998+2994﹣3002﹣2008
=8795+2994﹣(4998+3002)﹣2008
=11789﹣8000﹣2008
=1781;
171. 1999+999×999
=1999+999×(1000﹣1)
=1999+999000﹣999
=1000+999000
=1000000;
172. 38×25×6
=38×(25×6)
=38×150
=5700
173. 2.06×101
=2.06×(100+1)
=2.06×100+2.06×1
=206+2.06
=208.06;
174. 0.25×125×0.32
=0.25×125×0.4×0.8
=(0.25×0.4)×(125×0.8)
=0.1×100
=10;
175. 1.25×8.8
=1.25×(8+0.8)
=1.25×8+1.25×0.8
=10+1
=11;
176. 31.8×2.5+31.8×7.5
=31.8×(2.5+7.5)
=31.8×10
=318
177. 119×8×125,
=119×(8×125),
=119×1000,
=119000;
178. 38+129+71,
=38+(129+71),
=38+200,
=238;
179. 1756﹣398,
=1756﹣400+2,
=1356+2,
=1358;
180. 406×201,
=406×(200+1),
=406×200+406×1,
=81200+406,
=81606;
181. 16×125,
=2×8×125,
=2×(8×125),
=2×1000,
=2000;
182. 1900÷4÷25,
=1900÷(4×25),
=1900÷100,
=19
183. 8.35+3.8﹣2.35,
=8.35﹣2.35+3.8,
=6+3.8,
=9.8;
184. 15.4﹣(5.4+2.3),
=15.4﹣5.4﹣2.3,
=10﹣2.3,
=7.7;
185. 98×45,
=(100﹣2)×45,
=100×45﹣2×45,
=4500﹣90,
=4410;
186. 16×125×25,
=(8×125)×(2×25),
=1000×50,
=50000;
187. 12×69﹣69×2,
=(12﹣2)×69,
=10×69,
=690;
188. (20+8)×25,
=20×25+8×25,
=500+200,
=700
189. 9+99+999+9999+99999
=(10﹣1)+(100﹣1)+(1000﹣1)+(10000﹣1)+(100000﹣1)
=10+100+1000+10000+100000﹣5
=111110﹣5
=111105;
190. 1﹣2+3﹣4+5﹣6++1991﹣1992+1993
=1+(3﹣2)+(5﹣4)+(7﹣6)++(1991﹣1990)+(1993﹣1992)
=1+1×996
=997
191. 36×11
=36×(10+1)
=36×10+36×1
=360+36
=396;
192. 246×11
=246×(10+1)
=246×10+246×1
=2460+246
=2706
193. 678+354+322
=678+322+354
=1000+354
=1354;
194. 283+147+17+1653
=283+17+(147+1653)
=300+1800
=2100;
195. 384﹣(37+184)
=384﹣(184+37)
=384﹣184﹣37
=200﹣37
=163;
196. 2904﹣1327﹣173
=2904﹣(1327+173)
=2904﹣1500
=1404;
197. 653﹣197
=653﹣200+3
=453+3
=456;
198. 125×17﹣125
=125×(17﹣1)
=125×16
=125×8×2
=1000×2
=2000;
199. 235×99
=235×(100﹣1)
=235×100﹣235×1
=23500﹣235
=23265;
200. (1300﹣520)÷13
=1300÷13﹣520÷13
=100﹣40
=60;
201. 67×21+18×21+85×79
=21×(67+18)+85×79
=21×85+85×79
=85×(21+79)
=85×100
=8500;
202. 222222×999999
=222222×(1000000﹣1)
=222222×1000000﹣222222×1
=222222000000﹣222222
=222221777778
203. 18×+2,
=×+2,
=17.67+2,
=19.67;
204. ×﹣,
=﹣,
=﹣,
=﹣;
205. 0.8×7.3﹣63×20.08
=5.84﹣1265.04,
=﹣1259.2;
206. 65.5﹣4.29+24.6﹣5.71,
=(65.5+24.6)﹣(4.29+5.71),
=90.1﹣10,
=80.1;
207. 1991+1995+2000+1989+2011+2005+1998+1993,
=(2000﹣9)+(2000﹣5)+2000+(2000﹣11)+(2000+11)+(2000+5)+(2000﹣2)+(2000﹣7),
=2000×8﹣9﹣5﹣11+11+5﹣2﹣7,
=16000﹣18,
=15982
208. 99999×22222+33333×33334,
=33333×3×22222+33333×33334,
=33333×(66666+33334)
=33333×100000,
=3333300000;
209. 2003×2004÷2004×2004﹣2003×2004,
=2003×2004﹣2003×2004,
=0;
210. 2.8×(+),
=2.8×+2.8×,
=0.4+0.3,
=0.7;
211. 101×,
=(102﹣1)×,
=102×﹣1×,
=99﹣,
=98;
212. 9.81×10%+0.5×98.1+0.049×981,
=9.81×0.1+5×9.81+4.9×9.81,
=9.81×(0.1+5+4.9),
=9.81×10,
=98.1;
213. 23×+14×,
=23×+16×,
=(23+16)×,
=39×,
=14
214. 38.4×187﹣15.4×384+3.3×16
=38.4×(187﹣154)+3.3×16
=38.4×33+3.3×16
=3.3×(384+16)
=3.3×400
=1320
215. 3﹣(0.16+1)﹣1.84,
=3﹣0.16﹣1﹣1.84,
=3﹣1﹣(0.16+1.84),
=2﹣2,
=0;
216. 2009÷2009,
=2009,
=2009,
=2009×,
=;
或1÷(2009÷2009),
=1÷1,
=.
217. 9+99+999+9999﹣,
=[(9+99+999+9999)+()]﹣,
=[10+100+1000+10000﹣4+]﹣,
=11110﹣4,
=11106;
218. 4.03÷12.5,
=(4.03×8)÷(12.5×8),
=32.24÷100,
=0.3224
219. 1997+1998+1999+2001
=(2000﹣3)+(2000﹣2)+(2000﹣1)+(2000+1)
=2000×4﹣5
=7995;
220. 3425﹣188﹣212﹣25
=3425﹣(188+212)﹣25
=3425﹣400﹣25
=3000;
221. 567×999+567×2
=567×(999+2)
=567×(1000+1)
=567×1000+567
=567000+567
=567567;
222. (91×48×75)÷(25×13×16)
=(63×25×13×16)÷(25×13×16)
=63×(25×13×16)÷(25×13×16)
=63
223..×3+×5+×10,
=×(3+5+10),
=×18,
=5;
224. 999×7+111×7,
=7×(999+111),
=7×1110,
=7770,
225. 97×,
=(96+1)×,
=96×+1×,
=5+,
=5;
226. (+++)×2002,
=×2002+×2002+×2002+×2002;
=1001+286+182+154,
=1623;
227. 8.5×+0.75×5+6.5÷1,
=8.5×+×5+6.5×,
=×(8.5+5+6.5),
=×20,
=15;
228. ++++,
=+++++++++﹣1,
=1+10+100+1000+10000﹣1,
=11110
229.1.25×1.25×32,
=(1.25×8)×(1.25×4),
=10×5,
=50;
230. 15×(+)×17,
=(+)×17×15,
=×17×15+×17×15,
=17+15,
=32
231. 25×99+25,
=25×(99+1),
=25×100,
=2500;
232. 75×75+75×25,
=75×(75+25),
=75×100,
=7500;
233. 64×125,
=8×8×125,
=8×(8×125),
=8×1000,
=8000;
234. 17+64+83+36,
=(17+83)+(64+36),
=100+100,
=200;
235. 1200﹣128﹣72,
=1200﹣(128+72),
=1200﹣200,
=1000;
236. 3000÷125÷8,
=3000÷(125×8),
=3000÷1000,
=3
237. 65×8.7+6.5×0.23﹣0.65
=565.5+1.495﹣0.65,
=566.995﹣0.65,
=566.345;
238. ,
=1…,
=1﹣,
=