摘要：043]解(Ⅰ). .··························································································· 1分 将分别代入.得 . 解得.函数的解析式为．································· 3分 (Ⅱ)由已知.得.设的高为. .即. 根据题意..由.得. 当时.解得, 当时.解得. 的值为.··············································································· 6分 (Ⅲ)由已知.得. .. .化简得. .得. . 有. 又... 当时.,当时., 当时..························································································· 10分

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