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maths

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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 from 1 to 9 so that ABCD-DCBA=BDAC
3 solve x+y=28 xy=127

  • maths - ,

    1) is that x + (1/x) or (x+1)/x?

    2)
    7641 - 1467 = 6174

    3)
    (x,-y) = (14±√69)

  • maths - ,

    it is x+(1/x)

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