x-1/a - x-2a/a^2=1
问题描述：
x-1/a - x-2a/a^2=1
答
两边乘a^2
ax-a-x+2a=a^2
(a-1)x=a^2-a
(a-1)x=a(a-1)
a=1,x属于R
a≠1,x=a