已知在△ABC中,角A、B、C所对的边分别为a、b、c,且b2=a2+c2-3a 发布时间:2017-04-26 12:46 │ 来源:www.tikuol.com 题型:解答题 问题: 已知在△ABC中,角A、B、C所对的边分别为a、b、c,且b2=a2+c2-3ac,c=3b.(1)求角A;(2)若△ABC的外接圆半径为2,求△ABC的面积.
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