1) if x+1/x=2,then x^2012+1/x^2012=?
2)if A>B>C>D,find the digits A,B,C,D (which are from1 to 9), so that
3)solve:px-qy=r and rx-py=q.

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  1. x + 1/x = 2
    x = 1
    x^n + 1/x^n = 2 for any n


    x = p(pr-q^2)/(p^2-rq)
    y = (r^2-pq)/(p^2-rq)

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