解方程 (1)1/2[x-1/2(x-1)]=2/3(x-1); (2)0.1x−0.20.02−x+1/0.5=3.
问题描述:
解方程
(1)
[x-1 2
(x-1)]=1 2
(x-1);2 3
(2)
−0.1x−0.2 0.02
=3. x+1 0.5
答
(1)去括号得:
x-1 2
(x-1)=1 4
(x-1),2 3
去分母得:6x-3(x-1)=8(x-1),
去括号得:6x-3x+3=8x-8,
移项合并得:5x=11,
解得:x=2.2;
(2)方程变形得:
-10x−20 2
=3,即5x-10-2x-2=3,10x+10 5
移项合并得:3x=15,
解得:x=5.