4楼: Originally posted by dbb627 at 2013-05-23 15:25:51
mathematica
\text{Eliminate}
b^2 x^2==a^2 \left(b^2-y^2\right)\&\&\frac{b^2 x^2}{a^2}==b^2-y^2\&\&\frac{b^2 x^2}{a}==a \left(b^2-y^2\right)...

2楼: Originally posted by 月只蓝 at 2013-05-22 21:16:32
用长于做符号运算的Maple试试吧。若表达式太复杂，也许本身就得不到高等数学范畴内的关系式。