解方程:
x+2.4x=51
3.4x=51
x=15
5x-28=x
4x=28
x=7
2x-25*3=120
2x-75=120
2x=195
x=97.5
解方程:x加2.4x=51 5x=28=x 2x=25*3=120
解方程:x加2.4x=51 5x=28=x 2x=25*3=120
数学人气:750 ℃时间:2020-03-21 06:36:49
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