问题
填空题
化简 (1)
(2)
|
答案
(1)原式=
÷(x-1 x
)x2-1 x
=
×x-1 x x (x-1)(x+1)
=
;1 x+1
(2)原式=
•3(x-1) (x-1)(x+1)
-x+1 3x 1 x-1
=
-1 x 1 x-1
=
-x-1 x(x-1) x x(x-1)
=-1 x(x-1)
=-
.1 x2-x
化简 (1)
(2)
|
(1)原式=
÷(x-1 x
)x2-1 x
=
×x-1 x x (x-1)(x+1)
=
;1 x+1
(2)原式=
•3(x-1) (x-1)(x+1)
-x+1 3x 1 x-1
=
-1 x 1 x-1
=
-x-1 x(x-1) x x(x-1)
=-1 x(x-1)
=-
.1 x2-x