混合运算综合练习
【知识讲解】
1. 在四则运算里,加法和减法称为第一级运算,乘法和除法称为第二级运算。
2. 同一级运算:从左往右计算
没有括号的
两级运算:先算乘除,再算加减
有括号的:先算括号里面的,再算括号外面的
【巩固练习】
一、直接写得数。
2.8×25+12×2.5= (-)×30= ×25=
12.5×32×2.5= 1﹣+= 1÷×=
0.5﹣+0.5﹣= (+)×24= 7÷×7÷=
﹣×= 10﹣3.2﹣5.8= ×=
1÷5×= 12×(+)= 1.01﹣91%=
329+276= 8--= ÷=
÷×= 2÷-÷2= ×16-2÷=
0.7+0.35+0.6÷2= 1.2×5÷=
777+777-777×777÷777=
二、脱式计算。
1. (+)×
2. (+)÷﹣
3. ×+÷﹣×60%
4. +(﹣)×
5. 0.6÷[0.06×(9.85+15%)]
6. 12﹣12÷12%×0.01
7. 1÷+4×0.75
8. 36×75%+63×+0.75
9. [120%—(65%-0.35 )]÷
10. 79 ÷ 150 -29 ×
11. 14÷[( +)×]
12. (15.04﹣6.4)÷+110.2
13. 4.71÷[(﹣)×]
14. [×(0.25)]÷0.5
15. 304×45﹣4080÷24×75,
16. ﹣4.28×(0.375﹣),
17.(﹣×)÷(+2.5),
18. 6.4+3.6÷[(﹣3.5)×],
[来源:学科网]
19. [2+(5.4﹣3)×1]÷3
[来源:Zxxk.Com]
20.
21.
22.
23.[(+0.1÷2)×+1÷(+)]÷0.01
24. 26+10.5×÷8﹣(26﹣1.6÷×2)
25. 15÷〔( ﹣)÷〕﹣0.5,
26.(2.5×)÷(×1.8)-0.75÷
27. 9.8110%+98.1+0.049981
28. 8.25+[2.85﹣(3﹣10.8×)÷1]
[来源:Zxxk.Com]
29. [来源:Z*xx*k.Com]
30. ×(4.85÷﹣3.6+6.15×3)+[5.5﹣175×(1+)]
31.
参考答案:
一、【答案】100 15 20 1000
14 87 1 14
0.1 605 7 10 1.35 7.2 777 5
二、【答案】
1. (+)×
=×+×
=+
=;
2. (+)÷﹣
=÷﹣
=;
3. ×+÷﹣×60%
=×+×﹣×
=×(+﹣)
=×1
=;
4. +(﹣)×
=+(×﹣×)
=+(﹣)
=(+)﹣
=2﹣
=;
5. 0.6÷[0.06×(9.85+15%)]
=0.6÷[0.06×10]
=0.6÷0.6
=1;
6. 12﹣12÷12%×0.01
=12﹣100×0.01
=12﹣1
=11;
7. 1÷+4×0.75
=10+3
=13.
8. 36×75%+63×+0.75
=36×0.75+63×0.75+0.75×1
=(36+63+1)×0.75
=100×0.75
=75
9. [120%—(65%-0.35 )]÷
=[1.2—0.3] ÷
=0.9÷
=12
10. 79 ÷ 150 -29 ×
= 79×-29 ×
=(79-29)×
=50×
=
11. 14÷[( +)×]
=14÷[×]
=14÷
=14×
=36
12.(15.04﹣6.4)÷+110.2
=8.64×+110.2
=10.8+110.2
=121
13. 4.71÷[(﹣)×]
=4.71÷[×]
=4.71÷
=14.13;
14. [×(0.25)]÷0.5
=[×0.35]÷0.5
=0.2÷0.5
=0.4.
15. 304×45﹣4080÷24×75,
=13680﹣170×75,
=13680﹣12750,[来源:Zxxk.Com]
=930;
16. ﹣4.28×(0.375﹣),
=7.2﹣4.28×(﹣),
=7.2﹣4.28×,
=7.2﹣1.07,
=6.13;
17. (﹣×)÷(+2.5),
=(﹣)÷(+),
=÷,
=×,
=;
18. 6.4+3.6÷[(﹣3.5)×],
=6.4+3.6÷[(﹣)×],
=6.4+3.6÷[×],
=6.4+3.6÷6
=6.4+0.6
=7
19. [2+(5.4﹣3)×1]÷3
=[2+×]÷3
=[2+]÷3
=×
=;
20.
=
=
=
=
=
21. 1×17.6+36÷+2.64×12.5
=×17.6+36×+26.4×
=×(17.6+36+26.4)
=×80
=100
22.
=
=
=
=
=2
23.[(+0.1÷2)×+1÷(+)]÷0.01
=[(+0.05)×+1÷]÷0.01
=[0.3×+]÷0.01
=[+]÷0.01
=÷0.01
=;
24. 26+10.5×÷8﹣(26﹣1.6÷×2)
=26+8.4÷8﹣(26﹣10×2)
=26+1﹣(26﹣25)
=27﹣1
=26.
25. 15÷〔( ﹣)÷〕﹣0.5,
=15÷[(﹣)×]﹣0.5,
=15÷[×﹣×]﹣0.5,
=15÷[]﹣0.5,
=15÷2﹣0.5,
=7.5﹣0.5,
=7.
26.(2.5×)÷(×0.8)-0.75÷
=2÷0.2-×
=10-10
=0
27. 9.8110%+98.1+0.049981
=9.81×0.1+×10×9.81+0.049×1009.81
=9.81×0.1+5×9.81+4.99.81
=9.81×(0.1+5+4.9)
=9.81×10
=98.1
28. 8.25+[2.85﹣(3﹣10.8×)÷1]
=8.25+[2.85﹣(3.4﹣2.4)×]
=8.25+[﹣]
=+
=
29.
=()÷()
=(48﹣18)÷30
=30÷30
=1
30. ×(4.85÷﹣3.6+6.15×3)+[5.5﹣1.75×(1+)]
=×(4.85×3.6﹣3.6+6.15×3.6)+()
=×3.6×(4.85﹣1+6.15)+()
=0.9×10+1
=9+1
=10
31.
=(1)+(1﹣)+(1﹣)+…+(1﹣)
=1﹣+1﹣+1﹣+…+1﹣
=(1×8)﹣()
=8﹣(1﹣+﹣+﹣+…+﹣)
=8﹣(1﹣)
=