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Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 已解決
Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 已解決 
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國中數學問題 若a是負數 (a的平方)開根號 = -a
Dec 19th 2013, 15:00

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a的平方會變成正的，這版主知道吧 開根號規定取正的，a的絕對值是-a...
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