化简或计算(1)m2m-2+42-m(2)x-32x-4÷(5x-2-x-2).-数学

题目简介

化简或计算(1)m2m-2+42-m(2)x-32x-4÷(5x-2-x-2).-数学

题目详情

化简或计算
(1)
m2
m-2
+
4
2-m
            
(2)
x-3
2x-4
÷(
5
x-2
-x-2)
题型:解答题难度:中档来源:不详

答案

(1)原式=
m2
m-2
-class="stub"4
m-2

=
m2-4
m-2

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

=m+2;
(2)原式=class="stub"x-3
2(x-2)
÷
5-(x+2)(x-2)
x-2

=class="stub"x-3
2(x-2)
÷
-(x2-9)
x-2

=-class="stub"x-3
2(x-2)
class="stub"x-2
(x+3)(x-3)

=-class="stub"1
2x+6

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