7.5X2.3+1.9X2.5+22.5X0.4的简便运算

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7.5X2.3+1.9X2.5+22.5X0.4的简便运算7.5X2.3+1.9X2.5+22.5X0.4的简便运算7.5X2.3+1.9X2.5+22.5X0.4的简便运算原式=7.5*(1.9+0

7.5X2.3+1.9X2.5+22.5X0.4的简便运算
7.5X2.3+1.9X2.5+22.5X0.4的简便运算

7.5X2.3+1.9X2.5+22.5X0.4的简便运算
原式=7.5*(1.9+0.4)+1.9*2.5+22.5*0.4 =7.5*1.9+7.5*0.4+1.9*2.5+22.5*0.4 =1.9*(7.5+2.5)+0.4*(7.5+22.5) =1.9*10+0.4*30 =19+12 =31