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Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 投票中 |
Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 投票中 |
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甲 乙 丙 丁 數學問題-急
Jul 1st 2013, 00:57
明雄,您好: 甲+乙+丙=180─(1) 甲+乙+丁=197─(2) 甲+丙+丁=208─(3) 乙+丙+丁=222─(4) (1)+(2)+(3)+(4) 3(甲+乙+丙+丁)=180+197+208+222=807 →甲+乙+丙+丁=269─(5) (5)-(4)→甲=47 (5)-(3)→乙=61 (5)-(2)→丙=72 (5)-(1)→丁=89 年齡最大→89歲 Answer:(C)
參考資料: Leo小老師
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