问题 解答题
计算:
(1)
a2
a+1
-
1
a+1

(2)(1+
y-3
y+3
-2y
y2-9
答案

(1)原式=

(a-1)(a+1)
a+1

=a-1;

(2)原式=

2y
y+3
(y+3)(y-3)
-2y
=-y+3.

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