在三角形abc中,角a,b,c所对的边分别为a,b,c,已知c=2,acosb-bcosa=7acosB-bcosA=7/2.第一问:求bcosA的值。第二问:设a=4.求三角形ABC的面积
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/30 13:24:40
![在三角形abc中,角a,b,c所对的边分别为a,b,c,已知c=2,acosb-bcosa=7acosB-bcosA=7/2.第一问:求bcosA的值。第二问:设a=4.求三角形ABC的面积](/uploads/image/z/745991-71-1.jpg?t=%E5%9C%A8%E4%B8%89%E8%A7%92%E5%BD%A2abc%E4%B8%AD%2C%E8%A7%92a%2Cb%2Cc%E6%89%80%E5%AF%B9%E7%9A%84%E8%BE%B9%E5%88%86%E5%88%AB%E4%B8%BAa%2Cb%2Cc%2C%E5%B7%B2%E7%9F%A5c%3D2%2Cacosb-bcosa%3D7acosB-bcosA%3D7%2F2.%E7%AC%AC%E4%B8%80%E9%97%AE%3A%E6%B1%82bcosA%E7%9A%84%E5%80%BC%E3%80%82%E7%AC%AC%E4%BA%8C%E9%97%AE%3A%E8%AE%BEa%3D4.%E6%B1%82%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E7%9A%84%E9%9D%A2%E7%A7%AF)
xVnF
A1(рO> UVz#Tۊ)W~4bqW-ձcArJ;3|
E.Z0$ͽ{̝,Ρ)oX
sԓ.Q쭺.2_#QO|v*'5Ւ.i2svfwS|LeUm
5UI"2}c紝^*.e-%
)#Wiw6@S/7Z`YQk~DVAI|mk'?K[wL
קZ+~dtByYfDśQT$(/OzD-K/sYܓcvb:C~xVT=~, jzl`gP` Qr>٘X@CS,
ѧ:*]+_={zLIl\tvؽtoï*ەqiQy>Clҳ4UPyEy,/M<3N
DlTEn_7@`P|k,!Q[**5G+MtQOlq^ x#f(2U:Ik\
ΐ{MQqw9u<'$ 餅v/ت>\fҳ#ZuS
;^[UhՆ32ENsJdVH =`+Kd-:v1xASmNV(GUSI9)t::Gj_s>qQ9GKQ"/1R&`i5C_Fm\:;!ϑ?5Z>SOT@B,.bӫłCg@nN
dŵGeydP30!)0i]ӳ <=L X-Pm\l5v!IZg
/ >
ȌMgqԐL\7u#r$3諓D99=DteE0