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75*4.67+19.9*2.5
人气:236 ℃ 时间:2020-06-24 22:41:08
解答
75*4.67+19.9*2.5
=75*4+25*3*0.67+20*2.5-0.1*2.5
=300+25*2.01+20*2.5-25*0.01
=300+50+50
=400
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