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> 先化简,再求值:2x-1-1x2-1•x2+2x+1x-1,其中x=3+1.-数学
先化简,再求值:2x-1-1x2-1•x2+2x+1x-1,其中x=3+1.-数学
题目简介
先化简,再求值:2x-1-1x2-1•x2+2x+1x-1,其中x=3+1.-数学
题目详情
先化简,再求值:
2
x-1
-
1
x
2
-1
•
x
2
+2x+1
x-1
,其中x=
3
+1.
题型:解答题
难度:中档
来源:韶关
答案
原式=
class="stub"2
x-1
-
class="stub"1
(x+1)(x-1)
•
(x+1)
2
x-1
=
class="stub"2
x-1
-
class="stub"x+1
(x-1)
2
=
class="stub"2x-2-x-1
(x-1)
2
=
class="stub"x-3
(x-1)
2
当x=
3
+1时,原式=
3
-2
3
.
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先化简再求值:a-ba+2b÷a2-b2a2
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题目简介
先化简,再求值:2x-1-1x2-1•x2+2x+1x-1,其中x=3+1.-数学
题目详情
答案
=
=
当x=