1 / 24 小数混合运算专项训练
1、解方程。
(1)5x=450 (2)12(6-x)=42
(3)1.2×6+4x=12 (4)8.5x-x=22.5
2、用简便方法计算。
(1)0.25 ×3.2×12.5 (2)36×10.1
(3)0.25×44 (4)22.2×4+17.8×4
3、用脱式计算。
(1)2.6+1.4×1.5-1.5 (2)(37-3.6÷4.8)÷12.5
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(3)2.6+2.4×(1.4-1.05)(4)15.6÷16×(0.25+1.25)
30.8÷[14-(9.85+1.07)][60-(9.5+28.9)]÷0.18
2.881÷0.43-0.24×3.520×[(2.44-1.8)÷0.4+0.15]
28-(3.4+1.25×2.4)2.55×7.1+2.45×7.1
3 / 24 777×9+1111×30.8×[15.5-(3.21+5.79)]
(31.8+3.2×4) ÷ 531.5×4÷(6+3)
0.64×25×7.8+2.22÷2.5+2.5÷2
36.25÷4.25×9.9 5180-705×6
4 / 24 24÷2.4-2.5×0.8 (4121+2389)÷7
671×15-974 469×12+1492
19.4×6.1×2.35.67×0.2-0.62
18.1×0.92+3.93 0.4×0.7×0.25
5 / 24 0.78+5.436+1 4. 8× 5÷4+1÷4
9. 9x5÷6+5÷6 10. 3÷4x8÷9-1÷3
14. 31x5÷6-5÷6 16. 5÷9x18-14x2÷7
20. 3x2÷9+1÷3 35. 95÷(64-45)
6 / 24 36. 178-145÷5×6+42 7.2÷0.8-1.2×5
6.5×(4.8-1.2×4) 28-(3.4+1.25×2.4)
2.55×7.1+2.45×7.1 777×9+1111×3
(31.8+3.2×4)÷5 31.5×4÷(6+3)
7 / 24 0.64×25×7.8+2.2 2÷2.5+2.5÷2
194-64.8÷1.8×0.9 36.72÷4.25×9.9
5180-705×6 24÷2.4-2.5×0.8
(4121+2389)÷7 671×15-974
469×12+1492 405×(3213-3189)
8 / 24 19.4×6.1×2.3 5.67×0.2-0.62
18.1×0.92+3.93 0.043×24+0.875
0.4×0.7×0.25 0.78+5.436+1
4.07×0.86+9.12240×78÷(154-115)
1437×27+27×563〔75-(12+18)〕÷15
9 / 24
2160÷〔(83-79)×18〕280+840÷24×5
325÷13×(266-250)85×(95-1440÷24)
58870÷(105+20×2)1437×27+27×563
81432÷(13×52+78)[37.85-(7.85+6.4)] ×30
10 / 24 (947-599)+76×64 36×(913-276÷23)
[192-(54+38)]×67 81432÷(13×52+78)
(947-599)+76×6460-(9.5+28.9)÷0.18
2.881÷0.43-0.24×3.50.8×〔15.5-(3.21+5.79)〕
31.8 3.2×4)÷5194-64.8÷1.8×0.9
11 / 24 36.72÷4.25×9.93.416÷(0.016×35)
0.8×[(10-6.76)÷1.2] (6.8-6.8×0.55)÷8.5
0.12× 4.8÷0.12×4.8(58+37)÷(64-9×5)
812-700÷(9+31×11)156×[(17.7-7.2)÷3]
(3.2×1.5+2.5)÷1.6 85+14×(14+208÷26)
12 / 24 120-36×4÷18+35 9.72×1.6-18.305÷7
3.2×(1.5+2.5)÷1.6(58+37)÷(64-9×5)
(6.8-6.8×0.55)÷8.50.12× 4.8÷0.12×4.8
(3.2×1.5+2.5)÷1.6 120-36×4÷18+35
13 / 24 15-10.75×0.4-5.7 347+45×2-4160÷52
(58+37)÷(64-9×5) [(7.1-5.6)×0.9-1.15] ÷2.5
(3.2×1.5+2.5)÷1.6 5.4÷[2.6×(3.7-2.9)+0.62]
12×6÷(12-7.2)-6 3.2×6+(1.5+2.5)÷1.6
(3.2×1.5+2.5)÷1.6 120-144÷18+35
14 / 24 347+45×2-4160÷52 (58+37)÷(64-9×5)
95÷(64-45) 812-700÷(9+31×11)
120-36×4÷18+35(6.8-6.8×0.55)÷8.5
0.12× 4.8÷0.12×4.8 0.8×〔15.5-(3.21+5.79)〕
15 / 24 (31.8+3.2×4)÷5 31.5×4÷(6+3)
0.64×25×7.8+2.2 2÷2.5+2.5÷2
194-64.8÷1.8×0.9 36.72÷4.25×9.9
5180-705×6 24÷2.4-2.5×0.8
16 / 24 (4121+2389)÷7 671×15-974
469×12+1492
405×(3213-3189)
0.8×[(10-6.76)÷1.2]