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> 先化简,再求值:(1+1x)÷x2-1x,其中x=2.-数学
先化简,再求值:(1+1x)÷x2-1x,其中x=2.-数学
题目简介
先化简,再求值:(1+1x)÷x2-1x,其中x=2.-数学
题目详情
先化简,再求值:
(1+
1
x
)÷
x
2
-1
x
,其中x=
2
.
题型:解答题
难度:中档
来源:上海
答案
原式=
class="stub"x+1
x
÷
x
2
-1
x
=
class="stub"x+1
x
÷
(x+1)(x-1)
x
=
class="stub"x+1
x
•
class="stub"x
(x+1)(x-1)
=
class="stub"1
x-1
,
当x=
2
时,原式=
class="stub"1
2
-1
=
2
+1.
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已知a≠b,且a2-13a+1=0,b2-13b+1
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题目简介
先化简,再求值:(1+1x)÷x2-1x,其中x=2.-数学
题目详情
答案
=
=
=
当x=