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> 先化简2xx2-1÷(1-1x+1),再代入一个你喜欢且使原式有意义的数求值.-数学
先化简2xx2-1÷(1-1x+1),再代入一个你喜欢且使原式有意义的数求值.-数学
题目简介
先化简2xx2-1÷(1-1x+1),再代入一个你喜欢且使原式有意义的数求值.-数学
题目详情
先化简
2x
x
2
-1
÷(1-
1
x+1
)
,再代入一个你喜欢且使原式有意义的数求值.
题型:解答题
难度:中档
来源:不详
答案
class="stub"2x
x
2
-1
÷(1-
class="stub"1
x+1
)
=
class="stub"2x
(x-1)(x+1)
×
class="stub"x+1
x
=
class="stub"2
x-1
,
当x=2时,
原式=
class="stub"2
2-1
=2.
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先化简,再求值:,其中x=-1。-八年
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求值x-1x÷(x-1x),其中x=2-1.-数
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题目简介
先化简2xx2-1÷(1-1x+1),再代入一个你喜欢且使原式有意义的数求值.-数学
题目详情
答案
当x=2时,
原式=