8.45*3/4+2.55*0.75-3/4简算
人气:243 ℃ 时间:2020-02-10 02:57:20
解答
8.45*3/4+2.55*0.75-3/4
=8.45*0.75+2.55*0.75-1*0.75
=0.75*(8.45+2.55-1)
=0.75*10
=7.5
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