e=c/a=根号1+b^2/a^2=根号2所以b^2/a^2=1所以b^2=a^21.焦点x轴上设它为x^2/a^2-y^2/a^2=1把（-5,3）带入即可解出2.焦点在y轴 设为y^2/a^2-x^2/a^2=1还是带入M点解出a^2 即可打数学符号好累,希望采纳你也是...