Question

已知x+x/1=5,求x的三次方+x的三次方/1的值.

Answer 1

x+(1/x)=5
x^3+(1/x^3)
=(x+1/x)(x^2-1+1/x^2)
=(x+1/x)[(x+1/x)^2-3]
=5*(5^2-3)
=110
祝您在新的一年一帆风顺,二龙腾飞,三羊开泰,四季平安,五福临门,六六大顺,七星高照,八方来财,九九同心,十全十美.