nhchenyy
春芽
共回答了22个问题采纳率:95.5% 举报
1
a=12,b=7,c^2=144-49=95,c=√95
F1(√95,0),F2(-√95,0)
AB直线:x=√95
95/144+y^2/49=1
49/144=y^2/49
y^2=49^2/144
y=±49/12
Ax=√95,Ay=49/12,Bx=√95,By=-49/12
三角形AF2B周长=2(AF2+AF1)=4a=48
2
S=AB*F1F2/2=AB*OF1=2*(49/12)*√95=49√95/6
1年前
9