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6.7×9.9再加6.1用简便方法怎么算?

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

7.6*9.9=7.6(10.-0.1)=7.6*10-7.6*0.1=76-0.76=75.24

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

先用7/9加4/9(11/9),然后与1/6通分

9.9×7.6 =(10-0.1)*7.6 =76-0.76 =75.24

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

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

=(3+7)+9×3+6 =10+27+6 =43

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