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a9= -6 a1+8r= -6
-a1-4r- -10
a1+8r= -6
4r= -16 /4
r= -4
Podstawiamy za obliczone r;
a1+8r= -6
a1+8*(-4)= -6
a1-32= -6
a1=-6+32 (przy przenoszeniu zmieniamy znak)
a1=26
OBLICZANIE CIĄGÓW;
a1=26
a2=26+(-4)=22
a3=22+(-4)=18
a4=18+(-4)=14