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> 先简化x-1x÷(x-2x-1x),再任选一个适当的x值代入求值.-数学
先简化x-1x÷(x-2x-1x),再任选一个适当的x值代入求值.-数学
题目简介
先简化x-1x÷(x-2x-1x),再任选一个适当的x值代入求值.-数学
题目详情
先简化
x-1
x
÷(x-
2x-1
x
),再任选一个适当的x值代入求值
.
题型:解答题
难度:中档
来源:吉林
答案
原式=
class="stub"x-1
x
÷
x
2
-2x+1
x
=
class="stub"x-1
x
•
class="stub"x
(x-1
)
2
=
class="stub"1
x-1
(3分)
当x=2时,原式=
class="stub"1
2-1
=1
,(2分)
评分说明:x只要不取0和1,计算正确皆可得分.
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题目简介
先简化x-1x÷(x-2x-1x),再任选一个适当的x值代入求值.-数学
题目详情
答案
当x=2时,原式=
评分说明:x只要不取0和1,计算正确皆可得分.