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> 化简求值:(1)1x-1•x2-2x+1x+1,其中x=2;(2)(1x-1y)÷y-x3x2,其中x=2,y=3.-数学
化简求值:(1)1x-1•x2-2x+1x+1,其中x=2;(2)(1x-1y)÷y-x3x2,其中x=2,y=3.-数学
题目简介
化简求值:(1)1x-1•x2-2x+1x+1,其中x=2;(2)(1x-1y)÷y-x3x2,其中x=2,y=3.-数学
题目详情
化简求值:
(1)
1
x-1
•
x
2
-2x+1
x+1
,其中x=2;
(2)
(
1
x
-
1
y
)÷
y-x
3
x
2
,其中x=2,y=3.
题型:解答题
难度:中档
来源:不详
答案
(1)原式=
class="stub"1
x-1
•
(x-1)
2
x+1
=
class="stub"x-1
x+1
;
当x=2时,原式=
class="stub"2-1
2+1
=
class="stub"1
3
;
(2)原式=
class="stub"y-x
xy
•
3
x
2
y-x
=
class="stub"3x
y
;
当x=2,y=3时,原式=
class="stub"3×2
3
=2
.
故答案为
class="stub"1
3
、2.
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题目简介
化简求值:(1)1x-1•x2-2x+1x+1,其中x=2;(2)(1x-1y)÷y-x3x2,其中x=2,y=3.-数学
题目详情
(1)
(2)(
答案
当x=2时,原式=
(2)原式=
当x=2,y=3时,原式=
故答案为