zn ajdz trzynasty wyraz ciągu arytmetycznego jeśli a₂=3 a₆=4, a₅=0 a₆=1,5-
a2=a1+r
a6=a1+5r
a1+r=3
a1+5r=4
a1=3-r
3-r+5r=4
4r=1 <=> r=1/4
a1=3- 1/4
r=1/4
a1=11/4
a13=a1+ 12r
a13=23/4
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a2=a1+r
a6=a1+5r
a1+r=3
a1+5r=4
a1=3-r
3-r+5r=4
a1=3-r
4r=1 <=> r=1/4
a1=3- 1/4
r=1/4
a1=11/4
r=1/4
a13=a1+ 12r
a13=23/4