若a²-a+1=0,则2a³-a²+a+3=?

问题描述:

若a²-a+1=0,则2a³-a²+a+3=?

结果等于2.
2a³-a²+a+3=a³+a³-a²+a+3=a³+3=a²-a+3=a²-a+1+2=2