网址:http://m.1010jiajiao.com/timu_id_3868128[举报]
椭圆的焦点在y轴上,且,则这样的椭圆的个数为 .
(理)椭圆的焦点在y轴上,且m∈{1,2,3,4,5,5},n∈{1,2,3,4,5,6},则这样的椭圆的个数为________.
椭圆+=1的焦点在y轴上,且m∈{1,2,3,4,5},n∈{1,2,3,4,5,6,7},则这样椭圆的个数为
15
20
35
40