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*Ptr(małego)=1/2(b-2)(b-1)=1/2(b^2-b-2b+2)=1/2(b^2-3b+2)=1/2b^2-3/2b+1
*Ptr.zac.=Pt(d)-Pt(m)=1/2b^2-(1/2b^2-3/2b+1)=3/2b-1=1,5b-1