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1.345*2.69-1.345^2-0.345^2计算过程是?
人气:393 ℃ 时间:2020-02-05 04:45:39
解答
=1.345*(2.69-1.345)-0.345^2
=1.345^2-0.345^2
=(1.345+0.345)*(1.345-0.345)
=1.69*1
=1.69
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