Masz ciąg arytmetyczny (aᵥ) Dane : a₃ = 13 , a₅ = 39
Ile wynosi wyraz a₁
a₅=a₃+2r
39=13+2r
39-13=2r
26=2r /:2
r=13
a₃=a₁+2r
13=a₁+2*13
13=a₁+26
13-26=a₁
-13=a₁
a₁=-13
a4 = (a3 + a 5) / 2
a4 = (13+ 39) / 2 = 26
r= 13
a1 = -13
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a₅=a₃+2r
39=13+2r
39-13=2r
26=2r /:2
r=13
a₃=a₁+2r
13=a₁+2*13
13=a₁+26
13-26=a₁
-13=a₁
a₁=-13
a4 = (a3 + a 5) / 2
a4 = (13+ 39) / 2 = 26
r= 13
a1 = -13