x^2/45+y^2/20=1a^2=45,b^2=20c^2=45-20=25,c=5焦点：(5,0),(-5,0)与两个焦点的连线互相垂直,因此在以两个焦点为直径的圆上所以,坐标(x,y)满足：x^2+y^2=25x^2/45+y^2/20=1解方程组得：x^2=9,y^2=16所以,所求点为(3,...