Znajdz wyraz pierwszy x1 i roznice r ciagu arytmetycznego,w ktorym a4=-3 i a8=13
a₄=-3
a₈=13
a₈-a₄=4r
4r=13-(-3)
4r=16
r=4
a₁=a₄-3r
a₁=-3-3·4=-3-12=-15
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a₄=-3
a₈=13
a₈-a₄=4r
4r=13-(-3)
4r=16
r=4
a₁=a₄-3r
a₁=-3-3·4=-3-12=-15