e1=根号(m^2-n^2)/m,e2=根号(m^2+n^2)/m,e3=1,e1e2=根号【1-n^4/m^4】
设椭圆x^2/m^2+y^2/n^2=1,双曲线x^2/m^2-y^2/n^2=1,抛物线y^2=2(m+n)x,(m>
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