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September 2, 2014

September 2, 2014

Posted by **sagar** on Friday, June 8, 2012 at 3:41am.

2)if A>B>C>D,find the digits A,B,C,D (which are from1 to 9), so that

ABCD-DCBA=BDAC.

3)solve:px-qy=r and rx-py=q.

- maths -
**Steve**, Friday, June 8, 2012 at 5:15amx + 1/x = 2

x = 1

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

7641-1467=6174

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

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

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