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> (1)先化简,再求值:(1+1x-1)÷xx2-1,其中:x=-2.(2)请先将下式先化简,再选择一个你喜欢的数代入求值:(1x-1-1x+1).x2-1x.-数学
(1)先化简,再求值:(1+1x-1)÷xx2-1,其中:x=-2.(2)请先将下式先化简,再选择一个你喜欢的数代入求值:(1x-1-1x+1).x2-1x.-数学
题目简介
(1)先化简,再求值:(1+1x-1)÷xx2-1,其中:x=-2.(2)请先将下式先化简,再选择一个你喜欢的数代入求值:(1x-1-1x+1).x2-1x.-数学
题目详情
(1)先化简,再求值:
(1+
1
x-1
)÷
x
x
2
-1
,其中:x=-2.
(2)请先将下式先化简,再选择一个你喜欢的数代入求值:
(
1
x-1
-
1
x+1
).
x
2
-1
x
.
题型:解答题
难度:中档
来源:不详
答案
(1)
(1+
class="stub"1
x-1
)÷
class="stub"x
x
2
-1
=
class="stub"x
x-1
×
(x-1)(x+1)
x
=x+1;
(2)
(
class="stub"1
x-1
-
class="stub"1
x+1
).
x
2
-1
x
=
class="stub"2
x
2
-1
•
x
2
-1
x
=
class="stub"2
x
;
取x=1,则原式=2.
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题目简介
(1)先化简,再求值:(1+1x-1)÷xx2-1,其中:x=-2.(2)请先将下式先化简,再选择一个你喜欢的数代入求值:(1x-1-1x+1).x2-1x.-数学
题目详情
(2)请先将下式先化简,再选择一个你喜欢的数代入求值:(
答案
=
=x+1;
(2)(
=
=
取x=1,则原式=2.