解方程:2(3-y)=5-4(y+5) (2x+1)/6+(x-1)/3=1     60%x-(x+3)*50%=3

问题描述:

解方程:2(3-y)=5-4(y+5) (2x+1)/6+(x-1)/3=1     60%x-(x+3)*50%=3

2(3-y)=5-4(y+5)
6-2y=5-4y-20
21=-2y
y=-10.5
(2x+1)/6+(x-1)/3=1
2x+1+2x-2=6
4x=7
x=7/4
60%x-(x+3)*50%=3
0.6x-0.5x-1.5=3
0.1x=1.5
x=15确定都对吗?我同学教我的和你做的不一样耶。。对的最后一题我验算了一下不对。但还是给你满意。60%x-(x+3)*50%=30.6x-0.5x-1.5=30.1x=4.5x=45