中文谷先化簡再求值：(x＋1一)×，其中x＝－
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問題詳情：
先化簡再求值：(x＋1一
)×
，其中x＝－
【回答】
解：
=
··································································· 1分
=
························································································ 2分
=
························································································ 3分
=
···································································································· 4分
當
=
時·················································· 5分
原式=
=
······················································································· 6分
知識點：分式的運算
題型：解答題
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