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a2=5·2+2=12
a3=5·3+2=17
r=a2-a1=12-7=5
r=a3-a2=17-12=5
jest
b)a1=1,5do1=1,5
a2=1,5²=2,25
a3=1,5³=3,375
q=a2/a1=2,25/1,5=1,5
q=a3/a2=3,375/2,25=1,5
jest