1.设G是△ABC的重心,且(56sinA)*(向量GA)+(40sinB)*(向量GB)+(35sinC)*(向量GC)=0向量,则B的大小为?2.已知锐角A是△ABC的一个内角,a,b,c是三角形中各内角的对应边,若(sinA) ^2 - (cosA)^2=1/2,则 A
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/30 00:39:34
![1.设G是△ABC的重心,且(56sinA)*(向量GA)+(40sinB)*(向量GB)+(35sinC)*(向量GC)=0向量,则B的大小为?2.已知锐角A是△ABC的一个内角,a,b,c是三角形中各内角的对应边,若(sinA) ^2 - (cosA)^2=1/2,则 A](/uploads/image/z/4353561-9-1.jpg?t=1.%E8%AE%BEG%E6%98%AF%E2%96%B3ABC%E7%9A%84%E9%87%8D%E5%BF%83%2C%E4%B8%94%EF%BC%8856sinA%EF%BC%89%2A%EF%BC%88%E5%90%91%E9%87%8FGA%EF%BC%89%2B%EF%BC%8840sinB%EF%BC%89%2A%28%E5%90%91%E9%87%8FGB%EF%BC%89%2B%EF%BC%8835sinC%EF%BC%89%2A%28%E5%90%91%E9%87%8FGC%29%3D0%E5%90%91%E9%87%8F%2C%E5%88%99B%E7%9A%84%E5%A4%A7%E5%B0%8F%E4%B8%BA%3F2.%E5%B7%B2%E7%9F%A5%E9%94%90%E8%A7%92A%E6%98%AF%E2%96%B3ABC%E7%9A%84%E4%B8%80%E4%B8%AA%E5%86%85%E8%A7%92%2Ca%2Cb%2Cc%E6%98%AF%E4%B8%89%E8%A7%92%E5%BD%A2%E4%B8%AD%E5%90%84%E5%86%85%E8%A7%92%E7%9A%84%E5%AF%B9%E5%BA%94%E8%BE%B9%2C%E8%8B%A5%EF%BC%88sinA%EF%BC%89+%5E2+-+%28cosA%29%5E2%3D1%2F2%2C%E5%88%99+A)
xSn@~m,$遥݃} $ۧ^RT^ J
6iFm(U&i!DT'^^!"!ygov-Uygq>sW_YQ_M[۵l5me0Aוa1"