三角形的三边长分别为 a2＋b2、2ab、a2－b2（a、b都是正整数），则这个三角形是（）
影儿 |
发布日期：2010-04-11 22:07:04
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A．直角三角形 B．钝角三角形 C．锐角三角形 D．不能确定 |
