设A(x1,y1),B(x2,y2)
椭圆方程是x²+4y²=16
∴ x1²+4y1²=16 ①
x2²+4y2²=16 ②
①-②
∴ (x1-x2)(x1+x2)+4(y1-y2)(y1+y2)=0
∴ k(AB)=(y1-y2)/(x1-x2)=-(x1+x2)/[4(y1+y2)]
斜率不存在,
即所求直线方程是x=2
设A(x1,y1),B(x2,y2)
椭圆方程是x²+4y²=16
∴ x1²+4y1²=16 ①
x2²+4y2²=16 ②
①-②
∴ (x1-x2)(x1+x2)+4(y1-y2)(y1+y2)=0
∴ k(AB)=(y1-y2)/(x1-x2)=-(x1+x2)/[4(y1+y2)]
斜率不存在,
即所求直线方程是x=2