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czyli
a1 + 5r=0
5r= -a1
r= -a1/5
więc
a11=a1 + 10*r= a1 + 10*(-a1/5)= a1- 2a1= -a1
S11=0,5*[a1+a11]*11= 0,5(a1+ (-a1)]*11= 0,5*0*11=0
S11=0