题目内容
(1)计算:
-(
)-1-
(2)先化简,再求值:
÷(x-
),其中x=
-1
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(2)先化简,再求值:
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(1)原式=
-2-2-
…… (3分) =-4 …… (4分)
(2)原式=
÷
…… (2分) =
…… (4分)
当x=
-1,原式=
=
…………………… (5分)
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(2)原式=
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当x=
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(1)先把各二次根式和绝对值化简,化为最简后再按照从左到右的顺序计算即可。
(2)首先对所求分式进行化简,然后把x的值代入求解即可.
(2)首先对所求分式进行化简,然后把x的值代入求解即可.
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