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、用简易方法计算。 (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)]÷0.1820×[(2.44-1.8)÷0.4+0.15]
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2.55×7.1+2.45×7.1
0.8×[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÷4.25×9.95180-705×6 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+149219.4×6.1×2.3 18.1×0.92+3.930.4×0.7×0.25 4. 8× 5÷4+1÷49. 9x5÷6+5÷6 14. 31x5÷6-5÷616. 5÷9x18-14x2÷7 35. 95÷(64-45)36. 178-145÷5×6+422 / 9
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+2.22÷2.5+2.5÷2194-64.8÷1.8×0.936.72÷4.25×9.95180-705×624÷2.4-2.5×0.8(4121+2389)÷7671×15-974469×12+1492
5.67×0.2-0.62
0.4×0.7×0.250.78+5.436+1 240×78÷(154-115) 2160÷〔(83-79)×18〕280 85×(95-1440÷24)
81432÷(13×52+78) [37.85-
(947-599)+76×64405×(3213-3189)19.4×6.1×2.3 18.1×0.92+3.930.043×24+0.875
4.07×0.86+9.121437×27+27×563〔75-(12+18)〕÷15+840÷24×5325÷13×(266-250)58870÷(105+20×2)1437×27+27×563(7.85+6.4)] ×30
36×(913-276÷23)[192-(54+38)]×6781432÷(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÷1.8×0.936.72÷4.25×9.93.416÷(0.016×35)
0.8×[(10-6.76)÷1.2](6.8-6.8×0.55)÷8.50.12× 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)÷1.685+14×(14+208÷26)120-36×4÷18+35
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9.72×1.6-18.305÷73.2×(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)÷1.6120-36×4÷18+3515-10.75×0.4-5.7347+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)÷1.65.4÷[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)
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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
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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) (136+64)×(65-345÷23)38.85+14×(14+208÷26) 120-36×4÷18+35 (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
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3.2×(1.5+2.5)÷1.6 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÷28 812-700÷(9+31×11) (136+64)×(65-345÷23) (284+16)×(512-8208÷18)120-36×4÷18+35 (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
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(23.2×(1.5+2.5)÷1.6 45.6-1.6÷4= 5.38+7.85-5.37= 46.7÷0.8-1.2×5= 6-1.19×3-0.43= 47.6.5×(4.8-1.2×4)= 0.68×1.9+0.32×1.9 297×999
1983×21+21×3017 (0.123+123) ×1009 34×24+3481 0.8×0.196+0.094 105+895×57 32.47×23+27 39.01×18.3-901 76.5+2-2×184 49+23×14
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31×99 52×99+52 25×32×125
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