设三角形ABC的内角A,B,C所对的边分别为a,b,c,若bcosC+ccosB=asinA,则三角形ABC的形状为?
2.设三角形ABC的内角A，C所对的边分别为a，若b+c=2a，则3sinA=5sinB，则角C=？
人气：424 ℃ 时间：2019-10-26 08:44:50
解答
答案：A 直角三角形
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