在△ABC中,三边abc满足a²+b²=c+ab,求角C
人气：425 ℃ 时间：2019-10-10 06:39:06
解答
在△ABC中,三边abc满足a²+b²=c²+ab,求角C..
据余弦定理,c²=a²+b²-2abcosC,代入已知式得ab=2abcosC,
∴cosC=1/2,C=60°.
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