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12.5乘(0.8乘3.84)简便计算.

12.5乘(0.8乘3.84) =12.5*0.8*3.84 =10*3.84 =38.4 满意采纳奥

(1)x+2.7=12.5, x+2.7-2.7=12.5-2.7, x=9.8,把x=9.8代入原方程,方程左边=9.8+2.7=12.5,右边=12.5,左边=右边,故x=9.8是原方程的解;(2)x-10.75=3.84,x-10.75+10.75=3.84+10.75, x=14.59,把x=14.59原方程,方程的左边=14.59-10.75=3...

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