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)
=1-x+2 2
x-5 3
(2)
-y-3 5
=1.6y+4 0.2
(3)
[4 3
(3 4
x-2)-6]=11 5
(4)
-4x-1.5 0.5
=5x-0.8 0.2
+3. 1.2-x 0.1
答
(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
=1.6,10y+40 2
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:
x-2-8=1,1 5
解得:x=55;
(4)方程变形得:
-40x-15 5
=50x-8 2
+3,12-10x 1
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.