解方程: (1)x+2/2=1-x-5/3 (2)y-3/5-y+4/0.2=1.6 (3)4/3[3/4(1/5x-2)-6]=1 (4)4x-1.50.5-5x-0.80.2=1.2-x0.1+3.

问题描述:

解方程:
(1)

x+2
2
=1-
x-5
3

(2)
y-3
5
-
y+4
0.2
=1.6

(3)
4
3
[
3
4
(
1
5
x-2)-6]=1

(4)
4x-1.5
0.5
-
5x-0.8
0.2
=
1.2-x
0.1
+3

(1)去分母得:3(x+2)=6-2(x-5),
去括号得:3x+6=6-2x+10,
移项合并得:5x=10,
解得:x=2;
(2)方程变形得:

y-3
5
-
10y+40
2
=1.6,
去分母得:2(y-3)-5(10y+40)=16,
去括号得:2y-6-50y-200=16,
移项合并得:-48y=222,
解得:y=-
111
24

(3)去括号得:
1
5
x-2-8=1,
解得:x=55;
(4)方程变形得:
40x-15
5
-
50x-8
2
=
12-10x
1
+3,
去分母得:2(40x-15)-5(50x-8)=120-100x+30,
去括号得:80x-30-250x+40=150-100x,
移项合并得:-70x=140,
解得:x=-2.