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3.6×7.6×9.3÷(1.9×3.1×1.8)用简便计算

原式 =(12.6÷1.4)x(7.6÷1.9)x(2.32÷2.9) =9x4x0.8 =36x0.8 =28.8 供参考。

2.6÷2.6*1.9x1.9=1.9x1.9=3.61

8.4÷7.6÷(4.2÷1.9) =8.4÷7.6÷4.2*1.9 =8.4÷4.2*1.9÷7.6 =2*1.9÷7.6 =(2*1.9)÷(2*3.8) =1.9÷3.8 =1÷2 =0.5

(8.5×13.3×7.2)÷(1.7×1.8×1.9) =(8.5÷1.7)×(13.3÷1.9)×(7.2÷1.8) =3×7×4 =84

1972*37+197.2*1.9-986*70.38 =1972*(37+0.19-35.19) =1972*2 =3944 7.2*4.5*9.3/(1.8*1.5*3.1) =4*3*3 =36 12.6*7.6*2.32/1.9/1.4/2.9 =12.6*7.6*2.32/(1.9*1.4*2.9) =9*4*0.8 =28.8

解:根据提取公因式的简便方法, 原式=4/7x6/9+4/7x1/9 =4/7x(6/9+1/9) =4/7x7/9 =4/9

分配率

(1)9.6-11÷7+17×4=9.6-117+47=9.6-(117-47)=9.6-1=8.6;(2)318×7.4-318+3.6×3.125=3.125×7.4-3.125+3.6×3.125=3.125×(7.4-1+3.6)=3.125×10=31.25.

12.6*7.6*2.32/1.9*1.4*2.9

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