7.56×2.1+7.56×3.6+5.7×2.49怎么简便运算
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7.56×2.1+7.56×3.6+5.7×2.49=7.56x(2.1+3.6)+5.7x2.49=7.56x5.7+5.7x2.49=5.7x(7.56+2.49)=5.7x10.05=57.285
咨询记录 · 回答于2022-09-21
7.56×2.1+7.56×3.6+5.7×2.49怎么简便运算
快一点
7.56×2.1+7.56×3.6+5.7×2.49=7.56x(2.1+3.6)+5.7x2.49=7.56x5.7+5.7x2.49=5.7x(7.56+2.49)=5.7x10.05=57.285
5.7x10.05还可以再简便运算
5.7x10.05=5.7x(10+0.05)=5.7x10+0.05x5.7=57+0.285=57.285
答案是57.285
先计算7.56x2.1+7.56x3.6 =7.56x(2.1+3.6) =7.56x5.7
再计算7.56x5.7+5.7x2.49 =5.7x(7.56+2.49) =5.7x10.05
利用乘法分配律进行简便运算