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> 先化简,再求值:m2m-2+42-m,其中m=13-2.-数学
先化简,再求值:m2m-2+42-m,其中m=13-2.-数学
题目简介
先化简,再求值:m2m-2+42-m,其中m=13-2.-数学
题目详情
先化简,再求值:
m
2
m-2
+
4
2-m
,其中m=
1
3
-2
.
题型:解答题
难度:中档
来源:山西
答案
原式=
m
2
m-2
-
class="stub"4
m-2
=
m
2
-4
m-2
=
(m+2)(m-2)
m-2
=m+2,
当
m=
class="stub"1
3
-2
=
3
+2
(
3
-2)(
3
+2)
=-
3
-2
时,
原式=
-
3
-2+2=-
3
.
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题目简介
先化简,再求值:m2m-2+42-m,其中m=13-2.-数学
题目详情
答案
=
=
=m+2,
当m=
原式=-