已知a²+3a+1=0,求:⑴a+1/a;⑵a²+1/a²;⑶a³+1/a³;⑷a^4+1/a^4

问题描述:

已知a²+3a+1=0,求:⑴a+1/a;⑵a²+1/a²;⑶a³+1/a³;⑷a^4+1/a^4