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共回答了17个问题采纳率:82.4% 举报
1.20%/(0.31-2/5/10)*(2/7+4又1/5)
=20%(31%-4/%)*(10/35+147/35)
=20%*27%*157/35
=4%*27%*157/7
=16956/70000
=8478/35000
2.1/5+370%+6.3/5+12
=20%+370%+126%+1200%
=1716%
=17.16
3.9又1/2/(1/4+8.5*1/4)+0.4
=19/2/(9.5/4)+0.4
=19/2*4/9.5+0.4
=4+0.4
=4.4 .
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