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性质1Pmm+Pmm+1+Pmm+2+…+Pmn=1m+1Pm+1n+1(n≥m≥1).证明∵Pmk=1m+1〔(k+1)-(k-m)〕Pmk=1m+1〔(k+1)Pmk-(k-m)Pmk〕=1m+1(Pm+1k+1-Pm+1k),∴Pmm+Pmm+...
Property 1Pmm+Pmm+1+Pmm+2+...+Pmn=1m+1Pm+1n+1(n≥m≥1). Proof ∵Pmk=1m+1[(k+1)-(k-m)]Pmk=1m+1[(k+1)Pmk-(k-m)Pmk]=1m+1(Pm+1k+1-Pm+1k),∴Pmm+Pmm+...