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> 先化简再求值:化简a-1a÷(a-2a-1a),然后在0,1,2,3中选一个你认为合适的值,代入求值.-数学
先化简再求值:化简a-1a÷(a-2a-1a),然后在0,1,2,3中选一个你认为合适的值,代入求值.-数学
题目简介
先化简再求值:化简a-1a÷(a-2a-1a),然后在0,1,2,3中选一个你认为合适的值,代入求值.-数学
题目详情
先化简再求值:化简
a-1
a
÷(a-
2a-1
a
)
,然后在0,1,2,3中选一个你认为合适的值,代入求值.
题型:解答题
难度:中档
来源:响水县一模
答案
原式=
class="stub"a-1
a
÷
a
2
-2a+1
a
=
class="stub"a-1
a
÷
(a-1)
2
a
=
class="stub"a-1
a
•
class="stub"a
(a-1)
2
=
class="stub"1
a-1
,
当a=2时,(a的取值不唯一,只要a≠0、1)
原式=
class="stub"1
2-1
=1;
当a=3时,(a的取值不唯一,只要a≠0、1)
原式=
class="stub"1
3-1
=
class="stub"1
2
.
上一篇 :
若1a+1b=1c,则a2+b2+c2=(a+b-c)2.-
下一篇 :
先化简,再求值:1x+1-1x2-1÷x+1x
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题目简介
先化简再求值:化简a-1a÷(a-2a-1a),然后在0,1,2,3中选一个你认为合适的值,代入求值.-数学
题目详情
答案
=
=
=
当a=2时,(a的取值不唯一,只要a≠0、1)
原式=
当a=3时,(a的取值不唯一,只要a≠0、1)
原式=