e=c/a=根号3 /2c^2/a^2=3/4c^2=a^2-b^23/4a^2=a^2-b^2b^2=a^2/4.如果焦点在X轴上:设方程是x^2/a^2+y^2/b^2=1即x^2/(4b^2)+y^2/b^2=116/4b^2+5/b^2=1b^2=9a^2=36方程是x^2/36+y^2/9=1如果焦点在Y轴上,设y^2/a^2+x^2/b...