Let M(m? , n) Ellipse x 2/a 2+? y^2/b^2= 1(a>； B>0), r 1 and r2 are point m and point f &；; #832 1; (-c，0)，F & amp#8322; (c, 0), then (left focal radius) r &；; #832 1; =a+em, (right focal radius) r &；; #8322; =a？ -em, where e is eccentricity.

Deduction: R &；; #832 1; /∣MN 1∣=？ r & amp#8322; /∣MN2∣=e

Available: r 1=? e∣MN 1∣=？ e(a^2/？ c+m)=？ a+em，r2=？ e∣MN2∣=？ e(a^2/？ c-m)=？ Hmm.

So: ∣MF 1∣=? a+em,∣MF2∣=？ Hmm.

Honey, if you have time, you can have it yourself.