摘要： 解:(1)当或时.分式无意义. 因此.从已知数据中随机抽取一个数代替.能使已知分式有意义的概率为,··········· 2分 (2) ································································································ 4分 ．····················································································································· 5分 取0代入.得原式． 6分

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