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5=0,5+3r
4,5=3r
r=1,5
a1=0,5
a2=2
a3=3,5
a4=5
e)
13=a1+2r
18=a1+3r
a1=13-2r
18=13-2r+3r
18=13+r
r=5
a4=18
a3=13
a2=8
a1=3
kozystamy ze wzoru an=a1+(n-1)r