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> 先化简再求值:1x-1-1x2-x,其中x=2.-数学
先化简再求值:1x-1-1x2-x,其中x=2.-数学
题目简介
先化简再求值:1x-1-1x2-x,其中x=2.-数学
题目详情
先化简再求值:
1
x-1
-
1
x
2
-x
,其中x=2.
题型:解答题
难度:中档
来源:郴州
答案
原式=
class="stub"x
x(x-1)
-
class="stub"1
x(x-1)
=
class="stub"x-1
x(x-1)
,
=
class="stub"1
x
.
当x=2时,原式=
class="stub"1
x
=
class="stub"1
2
.
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先化简再求值:3ab-a3b+a2b2a2+2
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题目简介
先化简再求值:1x-1-1x2-x,其中x=2.-数学
题目详情
答案
=
=
当x=2时,原式=