计算(1)3/x-6/1-x-x+5/x2-x;(2)x/x2-2x+1÷(x+1/x2-1+1).
问题描述:
计算
(1)
-3 x
-6 1-x
;x+5
x2-x
(2)
÷(x
x2-2x+1
+1).x+1
x2-1
答
(1)原式=
+3 x
-6 x-1
=x+5 x(x-1)
=3x-3+6x-x-5 x(x-1)
=8(x-1) x(x-1)
;8 x
(2)原式=
÷x (x-1)2
=x+1+x2-1 (x+1)(x-1)
•x (x-1)2
=(x+1)(x-1) x(x+1)
.1 x-1