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6.7×9.9再加6.1用简便方法怎么算?

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: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

6.7×9.9+0.67×2 =6.7×9.9+6.7×0.2 =6.7×(9.9+0.2) =6.7×10.1 =6.7×(10+0.1) =6.7×10+6.7×0.1 =67+0.67 =67.67

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7.2×3.9+7.2×6.1的简算怎么算 解:采用分配律, 原式=7.2×3.9+7.2×6.1 =7.2x(3.9+6.1) =7.2x10 =72

9.9X6.7+0.67 =9.9x10x0.67+0.67 =99x0.67+0.67 =(99+1)x0.67 =100x0.67 =67

2.2×9.9+6.6×6.7 =2.2×3×3.3+6.6×6.7 =6.6×3.3+6.6×6.7 =6.6×(3.3+6.7) =6.6×10 =66

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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