(1)两边同时乘以x(x-1),得x2+2(x-1)=x(x-1),
化简,得2x-2=-x,
解得x=
;2 3
检验:当x=
时,x(x-1)≠0,故x=2 3
是原分式方程的解.2 3
(2)两边同时乘以x-3,得3=2(x-3)+x,
去括号,得3=2x-6+x,
解得,x=3;
检谈坦明验:信嫌当x=3时,x-3=0,故原含告分式方程无解.
(3)原式=(
-x?1 x?1
)?1 x?1
(x?1)(x+1) (x?2)2
=
?x?2 x?1
(x?1)(x+1) (x?2)2
=
; x+1 x?2
当x=-2时,原式=
(或当x=0时,原式=?1 4
).1 2