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9.42+2.8÷0.25 用简便计算

9.42+2.8÷0.25 = 9.42+2.8×4 = 9.42+11.2 = 20.62

9.42加2.8除以0.25 =9.42+(2.8×4)÷(0.25×4) =9.42+11.2

9.42+2.8÷0.28 =9.42+10 =19.42

3.9*7.2+2.8*9.4的简便运算 =3.9x7.2+2.8x3.9+2.8x5.5

=88÷(0.25×4) =88÷1 =88

4.7×2.8+3.6×9.4 =4.7×2.8+3.6×4.7x2 =4.7x(2.8+7.2

sorry, 数学计算没有简便算法的 通常这种算法优化,都是由你自己写出公式,然后去实现的

8.6+4=12.6; 0.35÷0.7=0.5; 6.5×0.2=1.3; 0.7×0.9=

2.25×7又5/1+2.8÷9/4 =2.25×7.2+2.8×2.25 =2.25×(7.2

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