(10分) 先化簡,再求值:,其中
.
當(dāng)時,原式
解析:解:原式··········································· 2分
··························································· 4分
···················································································· 8分
當(dāng)時,原式
······························································· 10分
科目:初中數(shù)學(xué) 來源:2011-2012學(xué)年寧夏銀川七年級下學(xué)期期末考試數(shù)學(xué)試卷(帶解析) 題型:解答題
(下面A、B、C三類題目中,可任選一類解答,多解的題目不記分.)
(A類8分)先化簡,再求值:,其中
.
(B類9分)先化簡,再求值:,其中
.
(C類10分)先化簡,再求值:,其中
.
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科目:初中數(shù)學(xué) 來源:2012學(xué)年人教版中考數(shù)學(xué)第一輪復(fù)習(xí)分式專項訓(xùn)練 題型:計算題
(2011重慶市潼南,21,10分)先化簡,再求值:,其中a =
-1.
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