摘要： 解 (Ⅰ)∵点P(2.2)在反比例函数的图象上. ∴．即． ···································································································· 2分 ∴反比例函数的解析式为． ∴当时.． ···························································································· 4分 (Ⅱ)∵当时.,当时.. ····················································· 6分 又反比例函数在时值随值的增大而减小. ············································· 7分 ∴当时.的取值范围为．································································ 8分

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