三角形角ABC的对边分别为abc且2b*cosA=c*cosA+a*cosC求角A的大小若a=根号7,b+c=4,求三角形面积
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/02 20:26:04
![三角形角ABC的对边分别为abc且2b*cosA=c*cosA+a*cosC求角A的大小若a=根号7,b+c=4,求三角形面积](/uploads/image/z/2501223-15-3.jpg?t=%E4%B8%89%E8%A7%92%E5%BD%A2%E8%A7%92ABC%E7%9A%84%E5%AF%B9%E8%BE%B9%E5%88%86%E5%88%AB%E4%B8%BAabc%E4%B8%942b%2AcosA%3Dc%2AcosA%2Ba%2AcosC%E6%B1%82%E8%A7%92A%E7%9A%84%E5%A4%A7%E5%B0%8F%E8%8B%A5a%3D%E6%A0%B9%E5%8F%B77%2Cb%2Bc%3D4%2C%E6%B1%82%E4%B8%89%E8%A7%92%E5%BD%A2%E9%9D%A2%E7%A7%AF)
xŔn@_SeF
U" =VERT;jHhHBUJBX9
ݵ@*of~m''SN}t2_~ldd#eR+js"ݲ4ݸ"_1K&ʠDt:qJ|hw\"TQGK"dڳiםJq2kP5az$I^4@@*Rפl<9#M{Le}`>E-'Q}V6nMv~2 Ҝ"$]'pr-e?+v||dE)TE!wrP%
a(XAAQV?5Lka#aSb؛A9:G31Ϝ\O؋O[d="\ٍ$@T9FD%W9c-s n{hzPk~3cV8B5]J@-99\F ULǗbRL=e*45bu1Ra#uQn"