将X=a代入则有a²-3a+1=0
2a^5-5a^4+2a³-8a²=a²(2a³-5a²+2a-8)=a²(2a³-6a²+2a+a²-8)=a²(a²-8)=a²(3a-9)
=3a³-9a²=3a(a²-3a)=-3a/(a²+1)=-3a/3a=-1
妈呀,累死了,终于解出来了.、
慢慢看吧兄弟,有不懂的问我.追问,百度Hi,