1.
y^2/100+x^2/36=1
2.
a^2=36,b^2=a^2-c^2=16
x^2/36+y^2/16=1或y^2/36+x^2/16=1
3.
显然焦点在x轴上,所以点(0,4)是短轴顶点,即c=3,b=4,所以a^2=b^2+c^2=25,方程为x^2/25+y^2/16=1
1.
y^2/100+x^2/36=1
2.
a^2=36,b^2=a^2-c^2=16
x^2/36+y^2/16=1或y^2/36+x^2/16=1
3.
显然焦点在x轴上,所以点(0,4)是短轴顶点,即c=3,b=4,所以a^2=b^2+c^2=25,方程为x^2/25+y^2/16=1