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2010年高考数学江苏卷第18题:在平面直角坐标系xOy中,如图1,已知椭圆x~2/9+y~2/5=1的左右顶点为A、B,右焦点为F,设过点T(t,m)的直线TA,TB与椭圆分别交于点M(x_1,y_1),N(x_2,y_2),其中m>0,y_1>0,y_2<0.
In the plane Cartesian coordinate system xOy, as shown in Figure 1, it is known that the left and right vertices of the ellipse x ~ 2/9 + y ~ 2/5 = 1 are A and B and the right focus is F , And the straight lines TA, TB and oval with point T (t, m) intersect at points M (x_1, y_1) and N (x_2, y_2) respectively, where m> 0, y_1> 0 and y_2 <0.