Oblicz wyraz a1 oraz roznice r ciagu arytmetycznego, w ktorym a5=28 i a8=37
a₅ = 28 = a₁ +4r
a₈ = 37 = a₁ + 7r
a₁ + 4r = 28 / · (-1)
a₁ + 7r = 37
-a₁ - 4r = -28
3r = 9
r = 3
a₁ + 4 · 3 = 28
a₁ + 12 = 28
a₁ = 16
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a₅ = 28 = a₁ +4r
a₈ = 37 = a₁ + 7r
a₁ + 4r = 28 / · (-1)
a₁ + 7r = 37
-a₁ - 4r = -28
a₁ + 7r = 37
3r = 9
r = 3
a₁ + 4 · 3 = 28
a₁ + 12 = 28
a₁ = 16