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78.1x54.3+45.45x78.1+78.1/4简便计算
人气:259 ℃ 时间:2020-04-29 08:43:52
解答
78.1x54.3+45.45x78.1+78.1/4
=78.1x54.3+45.45x78.1+78.1×0.25
=78.1x(54.3+45.45+0.25)
=78.1×100
=7810
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