已知12+【2/5*0.75+(1/2+口)*5】/0.3=98,那么口=?
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![已知12+【2/5*0.75+(1/2+口)*5】/0.3=98,那么口=?](/uploads/image/z/1083572-44-2.jpg?t=%E5%B7%B2%E7%9F%A512%2B%E3%80%902%2F5%2A0.75%2B%281%2F2%2B%E5%8F%A3%29%2A5%E3%80%91%2F0.3%3D98%2C%E9%82%A3%E4%B9%88%E5%8F%A3%3D%3F)
已知12+【2/5*0.75+(1/2+口)*5】/0.3=98,那么口=?
已知12+【2/5*0.75+(1/2+口)*5】/0.3=98,那么口=?
已知12+【2/5*0.75+(1/2+口)*5】/0.3=98,那么口=?
12+[2/5×0.75+(1/2+口)×5]/0.3=98
[2/5×3/4+(1/2+口)×5]/0.3=98-12
[3/10+(1/2+口)×5]/0.3=86
3/10+(1/2+口)×5=0.3×86
0.3+(1/2+口)×5=25.8
(1/2+口)×5=25.8-0.3
(1/2+口)×5=25.5
1/2+口=25.5÷5
0.5+口=5.1
口=5.1-0.5
口=4.6