解:(1)當(dāng)或時(shí).分式無(wú)意義. 因此.從已知數(shù)據(jù)中隨機(jī)抽取一個(gè)數(shù)代替.能使已知分式有意義的概率為,··········· 2分 (2) ································································································ 4分 ．····················································································································· 5分 取0代入.得原式． 6分 【查看更多】

 

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