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zamiast a2 wstawiam a1+r
zamiast a5 wstawiam a1+4r
r=1 2a1+9*1=11
2a1=2
a1=1
5.16.2
-1,5r=-3
r=2
a1+5*2=10
a1=0
5.16.3
r=3
2a1+19*3=37
2a1=-20
a1=-10
5.16.4
r=1/2
2a1+8=16
2a1=8
a1=4
5.16.2:
5.16.3:
5.16.4