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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
(3)0.25×44
3、用递等式计算。
(1)2.6+1.4×1.5-1.5
(3)2.6+2.4×(1.4-1.05)
30.8÷[14-(9.85+1.07)] [60-
2.881÷0.43-0.24×3.5
28-(3.4+1.25×2.4)
777×9+1111×3
(2)36×10.1 (4)22.2×4+17.8×4 (2)(37-3.6÷4.8)÷12.5 (4)15.6÷16×(0.25+1.25) (9.5+28.9)]÷0.18 20×[(2.44-1.8)÷0.4+0.15]2.55×7.1+2.45×7.1 0.8×[15.5-(3.21+5.79)]
(31.8+3.2×4) ÷ 5 31.5×4÷(6+3)
0.64×25×7.8+2.2 2÷2.5+2.5÷2
36.25÷4.25×9.9 5180-705×6
24÷2.4-2.5×0.8
671×15-974
5.67×0.2-0.62
0.78+5.436+1
10. 3÷4x8÷9-1÷3
20. 3x2÷9+1÷3
7.2÷0.8-1.2×5
2.55×7.1+2.45×7.1
(4121+2389)÷7 469×12+1492 19.4×6.1×2.3 18.1×0.92+3.93 0.4×0.7×0.25 4. 8× 5÷4+1÷4 9. 9x5÷6+5÷6 14. 31x5÷6-5÷6 16. 5÷9x18-14x2÷7 35. 95÷(64-45) 36. 178-145÷5×6+42 6.5×(4.8-1.2×4) 28-(3.4+1.25×2.4) 777×9+1111×3 (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 (4121+2389)÷7 671×15-974
469×12+1492
5.67×0.2-0.62
0.4×0.7×0.25 0.78+5.436+1
240×78÷(154-115)
2160÷〔(83-79)×18〕 280
85×(95-1440÷24)
81432÷(13×52+78) [37.85-
(947-599)+76×64
405×(3213-3189) 19.4×6.1×2.3 18.1×0.92+3.93 0.043×24+0.875 4.07×0.86+9.12 1437×27+27×563 〔75-(12+18)〕÷15+840÷24×5 325÷13×(266-250) 58870÷(105+20×2) 1437×27+27×563(7.85+6.4)] ×30 36×(913-276÷23) [192-(54+38)]×67
81432÷(13×52+78) (947-599)+76×64 60-(9.5+28.9)÷0.18
2.881÷0.43-0.24×3.5 0.8×〔15.5-(3.21+5.79)〕 (31.8 3.2×4)÷5
194-64.8÷1.8×0.9 36.72÷4.25×9.9 3.416÷(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) 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)÷8.5 0.12× 4.8÷0.12×4.8 (3.2×1.5+2.5)÷1.6
120-36×4÷18+35 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+35 347+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)〕 (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 (4121+2389)÷7
671×15-974
469×12+1492
405×(3213-3189)
0.8×[(10-6.76)÷1.2] 19.4×6.1×24 5.67×0.2-0.62 18.1×0.92+3.93 24+0.875×99 0.4×0.7×0.25 0.75×102 100-56.23
31.50+160÷40
(58+370)÷(64-45) 32.120-144÷18+35 33.347+45×2-4160÷52 34(58+37)÷(64-9×5) 35.95÷(64-45) 36.178-145÷5×6+42 420+580-64×21÷28
37.812-700÷(9+31×11)