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7.8+2%7.8+2用简便方法计算

7/8+5/7+2/7简便计算 =5/7+2/7+7/8 =1+7/8 =1又7/8

7.8+2-7.8+2 =(7.8-7.8)+(2+2) =0+4 =4 分配法

(首项+末项)×项数÷2=和,所以,(1+10)×10÷2=55

8/15+7/15+2/7-5/7 =1-3/7 =4/7

7.8-7.5+2-2-2.5 =7.8-(7.5+2.5)+(2-2) =7.8-10 =-2.2

7.8*9+78 =7.8*【10-1】+78 =78+78-7.8 =156-7.8 =148.2 满意采纳

7.8÷2.6×(6.9+5.7)用简便方法 7.8÷2.6×(6.9+5.7) =3*12.6 =37.8

(1+10)*10/2 等差数列:(高斯定理) 首项加尾项的和,乘项数,再除以2。

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