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7×9×(6/7%1/9)的简便计算方法

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

6.76×9点9+67点6×1用简便方法计算 6.76×9点9+67点6×1 =6.76*9.9+6.76*10 =6.76*(10+10-0.1) =6.76*20-6.76*0.1 =134.524

解:采用结合律, 原式=7/9-(1/6-2/9) =7/9-1/6+2/9 =(7/9+2/9)-1/6 =1-1-6 =5/6

4.3×9.8+7.6×9.8-1.9×9.8 =9.8x(4.3+7.6-1.9) =9.8x10 =98

1×1/3)+3×1/5)+5×1/7加7×1/9简便算法计算 1×1/3)+3×1/5)+5×1/7加7×1/9 =1/2*(1-1/3+1/3-1/5+1/5-1/7+1/7-1/9) =1/2*8/9 =4/9

用简算方法计算 0.78+7.8×1.9 =0.78+0.78x19 =0.78x(1+19) =0.78x20 =15.6

分配率

(5/7)+(5/9)x(3/2)+(1/6)=(5/7)+(5/6)+(1/6) =(5/7)+[(5/6)+(1/6)] =(5/7)+1 =1又7分之5.

5/1x6/1+6/1x7/1+7/1x8/1+8/1x9/1+9/1x10/1 =5X6+6X7+7X8+8X9+9X10 =6X12+7X8+9X18 =6X(12+27)+7X8 =6X39+7X8 =234+56 =290

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