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#1 2009-06-08 09:10:38
please see it!!!
1. m+(m+p)+(m+2p)+(m+3p)+.........+n={(m+n)/2}[{(n-m)/p}+1]
2.{(x+y)/x}*{(x+y)/y}={(x+y)/x}+{(x+y)/y}
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