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> 先化简,再求值:2x4-x2÷(3xx-2-xx+2),其中x=3-4.-数学
先化简,再求值:2x4-x2÷(3xx-2-xx+2),其中x=3-4.-数学
题目简介
先化简,再求值:2x4-x2÷(3xx-2-xx+2),其中x=3-4.-数学
题目详情
先化简,再求值:
2x
4-
x
2
÷(
3x
x-2
-
x
x+2
)
,其中x=
3
-4.
题型:解答题
难度:中档
来源:不详
答案
原式=
class="stub"2x
(2-x)(2+x)
÷
2x(x+4)
(x-2)(x+2)
,
=
class="stub"2x
(2-x)(2+x)
•
(x-2)(x+2)
2x(x+4)
=
-
class="stub"1
(x+4)
;
当
x=
3
-4
时,
原式=
-
3
3
.
上一篇 :
化简:=()。-九年级数学
下一篇 :
化简:=(),=()。-八年级数学
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题目简介
先化简,再求值:2x4-x2÷(3xx-2-xx+2),其中x=3-4.-数学
题目详情
答案
=
=-
当x=
原式=-