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> (本题5分)先化简,再求值:,其中.-九年级数学
(本题5分)先化简,再求值:,其中.-九年级数学
题目简介
(本题5分)先化简,再求值:,其中.-九年级数学
题目详情
(本题5分)先化简,再求值:
,其中
.
题型:解答题
难度:中档
来源:不详
答案
解:
。…………………(1分)
…………………(2分)
………………………(3分)
当
时,原式=
。…………………(5分)
略
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计算:.-九年级数学
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题目简介
(本题5分)先化简,再求值:,其中.-九年级数学
题目详情
答案
当