解方程;2(200-15x)=70+25x,3(2x+1)=12,5分之x+2=4分之x,2分之3-x=3分之x+4
人气:273 ℃ 时间:2020-04-03 04:25:30
解答
①2(200-15x)=70+25x
400-30x=70+25x 55x=330 x=6
②3(2x+1)=12
6x+3=12 6x=9 x=3/2
③x/5+2=x/4
4x+40=5x x=40
④3/2-x=x/3+4
4x/3=3/2-4 4x/3=-5/2 x=-15/8
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