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skoro a2-a1=-4 czyli różnica r=-4
a3=a1+2r
4,5=a1+2*(-4)
a1=4,5+8=12,5= pierwszy wyraz
a2=a1+r=12,5-4=8,5
a3=4,5
a4=a3+r=4,5-4=0,5
a5=a4+r=0,5-4=-3,5
a6=a5+r=-3,5-4=-7,5