7.816x1.45+1.69x7.816+3.14x2.184(脱试计算)

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简算7.816x1.45+3.14x2.184+1.69x7.86
麦兜家姐1年前1
hi396 共回答了12个问题 | 采纳率83.3%
应该是题目抄错了吧?应该是?
7.86x1.45+3.14x2.14+1.69x7.86
=7.86x1.45+1.69x7.86+3.14x2.184
=7.86x(1.45+1.69)+3.14*2.14
=7.86*3.14+2.14*3.14
=3.14*(7.86+2.14)=3.14*10=31.4