问题 解答题
化简或计算
(1)
m2
m-2
+
4
2-m
            
(2)
x-3
2x-4
÷(
5
x-2
-x-2)
答案

(1)原式=

m2
m-2
-
4
m-2

=

m2-4
m-2

=

(m+2)(m-2)
m-2

=m+2;

(2)原式=

x-3
2(x-2)
÷
5-(x+2)(x-2)
x-2

=

x-3
2(x-2)
÷
-(x2-9)
x-2

=-

x-3
2(x-2)
x-2
(x+3)(x-3)

=-

1
2x+6

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