解方程. (1)2x+1=2-x; (2)5-3(x-1)=3; (3)2y−13=y+2/4−1; (4)y−y−12=2−y+2/6.
问题描述:
解方程.
(1)2x+1=2-x;
(2)5-3(x-1)=3;
(3)
=2y−1 3
−1;y+2 4
(4)y−
=2−y−1 2
. y+2 6
答
(1)移项合并得:3x=1,
解得:x=
;1 3
(2)去括号得:5-3x+3=3,
移项合并得:3x=5,
解得:x=
;5 3
(3)去分母得:8y-4=3y+6-12,
移项合并得:5y=-2,
解得:y=-
;2 5
(4)去分母得:6y-3y+3=12-y-2,
移项合并得:4y=7,
解得:y=
.7 4