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2x^2=y(y+1)=>(2y+1)^2-2(2x)^2=1

Posted by frkstyc at 2005-04-12 21:05:00 on Problem 1320
In Reply To:(3+2sqrt(2))^n的1的系数就是2y+1,但好像很难用的样子? Posted by:frkstyc at 2005-04-12 21:04:22


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