我在程序中,得到一字符表达式


"ans =

x5*x1^4*x2^2*x3^2*x4^4+x5*x1^4*x2*x3^2*x4^2+x5*x1^2*x2^2*x3*x4^4+x2*x3*x5^2*x1^2*x4+x2*x3*x5^2*x1*x4^2"
请教一下各位高手怎样把它化为字符串?

能不能说清楚一点,要
x5*x1^4*x2^2*x3^2*x4^4+x5*x1^4*x2*x3^2*x4^2+x5*x1^2*x2^2*x3*x4^4+x2*x3*x5^2*x1^2*x4+x2*x3*x5^2*x1*x4^2
这串吗?

是的,
,我的目的是要得到字符串"x5*x1^4*x2^2*x3^2*x4^4+x5*x1^4*x2*x3^2*x4^2+x5*x1^2*x2^2*x3*x4^4+x2*x3*x5^2*x1^2*x4+x2*x3*x5^2*x1*x4^2
",然后对其进行排序或者拿掉其中一部分,但串"x5*x1^4*x2^2*x3^2*x4^4+x5*x1^4*x2*x3^2*x4^2+x5*x1^2*x2^2*x3*x4^4+x2*x3*x5^2*x1^2*x4+x2*x3*x5^2*x1*x4^2
"就得不到.

谢谢!