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> 计算:(1)x+2x2-6x+9÷13-x×x-3x+2(2)(x2-1x2-2x+1-x+1)÷xx-1.-数学
计算:(1)x+2x2-6x+9÷13-x×x-3x+2(2)(x2-1x2-2x+1-x+1)÷xx-1.-数学
题目简介
计算:(1)x+2x2-6x+9÷13-x×x-3x+2(2)(x2-1x2-2x+1-x+1)÷xx-1.-数学
题目详情
计算:(1)
x+2
x
2
-6x+9
÷
1
3-x
×
x-3
x+2
(2)
(
x
2
-1
x
2
-2x+1
-x+1)÷
x
x-1
.
题型:解答题
难度:中档
来源:不详
答案
(1)
class="stub"x+2
x
2
-6x+9
÷
class="stub"1
3-x
×
class="stub"x-3
x+2
=
class="stub"x+2
(x-3
)
2
×(3-x)×
class="stub"x-3
x+2
=-1;
(2)
(
x
2
-1
x
2
-2x+1
-x+1)÷
class="stub"x
x-1
=[
(x-1)(x+1)
(x-1
)
2
-
(x-1
)
2
x-1
]×
class="stub"x-1
x
=
-
x
2
+3x
x-1
×
class="stub"x-1
x
=-x+3.
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题目简介
计算:(1)x+2x2-6x+9÷13-x×x-3x+2(2)(x2-1x2-2x+1-x+1)÷xx-1.-数学
题目详情
答案
=
=-1;
(2)(
=[
=
=-x+3.