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标题: [求助]一题 [打印本页]

作者: wujie_rens    时间: 2005-12-31 07:33     标题: [求助]一题

x^2+1/x^2=4, 问x^4+1/x^4=?
请问该怎么做?谢谢!
作者: pipa66    时间: 2005-12-31 07:51

(x^2+1/x^2)^2=16, you should get the answer afterwards.
作者: wujie_rens    时间: 2006-1-1 20:50

thanks !!!!!!!




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