焦点在x轴上的椭圆x²／m＋y²／36=1焦距为2,则m=

题目

焦点在x轴上的椭圆x²／m＋y²／36=1焦距为2,则m=

答案

2c=2
c=1
c^2=1
b^2=36
a^2=m
m-36=1
m=36+1
m=37