急 (19 15:35:56)已知三角形ABC的顶点坐标分别为A(1,1),B(4,1),C(4,5),求cosA,cosB,cosC的值.
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![急 (19 15:35:56)已知三角形ABC的顶点坐标分别为A(1,1),B(4,1),C(4,5),求cosA,cosB,cosC的值.](/uploads/image/z/701136-0-6.jpg?t=%E6%80%A5+%2819+15%3A35%3A56%29%E5%B7%B2%E7%9F%A5%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E7%9A%84%E9%A1%B6%E7%82%B9%E5%9D%90%E6%A0%87%E5%88%86%E5%88%AB%E4%B8%BAA%281%2C1%29%2CB%284%2C1%29%2CC%284%2C5%29%2C%E6%B1%82cosA%2CcosB%2CcosC%E7%9A%84%E5%80%BC.)
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