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7.8*9.9怎么简算

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+7.8 =7.8x(9+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

8.7*9.9=8.7*(10-0.1)=8.7*10-8.7*0.1=87-0.87=86.13 你说的是这个么?

7.8*9.9 =7.8*(10-0.1) =7.8*10-7.8*0.1 =78-0.78 =77.22 望采纳^_^

g

78×(9.9+0.1)

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。

8.7x9.9 =8.7x(10-0.1) =8.7x10-8.7x0.1 =87-0.87 =86.13

7×(4/7+8/9)×9 =7×4/7×9+7×8/9×9 =4×9+7×8 =36+56 =92

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