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Yahoo!奇摩知識+ - 分類問答 - 教育學習 - 已解決
Yahoo!奇摩知識+ - 分類問答 - 教育學習 - 已解決
這題數學怎麼做?
May 12th 2013, 07:51

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設前幾次共考了X次(不含最後一次) 則 68*X+86 / (X+1)總次數 =70 交叉相乘: 70*(X+1) = 68X+86 移向 2X=16 所以X=8 總次數就是 8+1 =9 共九次(解)...

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