摘要：1．先化简.再求值:.其中. 答案:解:原式 ．····················································································································· 6分 当.时. 原式．···························································································· 8分 本题主要考察了分式运算及学生运算能力.本题特色是让学生自己选择数带入计算.这要照顾到方式是否有意义情况.讲解时强调在通分时不要漏乘.

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