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7.8*9.9怎么简算

7.8*9+7.8 =7.8*(9+1) =7.8*10 =78

78×(9.9+0.1)

7.8×9.9脱式计算(能简便的就简便) 7.8×9.9 =7.8*(10-0.1) =7.8*10-7.8*0.1 =78-0.78 =77.22

供参考

7.8x9+7.8用简便方法 =7.8x(9+1) =7.8x10 =78

=7.8X9.9+7.8X0.1 =7.8X(9.9+0.1) =7.8X10 =78

7.8×9.9简便算法 7.8×9.9 =78*10-7.8*0.1 =78-0.78 =77.22

怎样简算 8/7 十9/7十 11/7 =17/7十11/7 =28/7 二4

7.8+7.8×1.9 =7.8+7.8x(2-0.1) =7.8+7.8x2-7.8x0.1 =3x7.8-0.78 =23.4-0.78 =22.62。

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