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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

7.8x9+7.8用简便方法 =7.8x(9+1) =7.8x10 =78

78×(9.9+0.1)

7.8x9.9+0.87 =0.78x99+0.78+0.09 =0.78x(99+1)+0.09 =0.78×100+0.09 =78+0.09 =78.09

因为7.91=7.8+0.11 所以,原式=7.8*9+7.8+0.11 =7.8*10+0.11 =78.11

9.8+0.7-9.8+0.7 =(9.8-9.8)+0.7+0.7 =1.4

7.8*9.9+0.78 =7.8x9.9+7.8x0.1 =7.8x(9.9+0.1) =7.8x10 =78 朋友,请【采纳答案】,您的采纳是我答题的动力,谢谢。

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

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

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