问题 解答题
计算:
(1)x(2-
1
x
)+
x
x2-2x
•(x2-4)
;          
(2)
1
1+x
+
2x
1-x2
答案

(1)原式=x•

2x-1
x
+
x
x(x-2)
•(x+2)(x-2)

=2x-1+x+2

=3x+1;

(2)原式=

1-x+2x
(1-x)(1+x)

=

1
1-x

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