Wyznacz różnice r wyrazów ciagu arytmetycznego, mając dane:
Sn=518, an=24, n=12
S₁₂=½(a₁+a₁₂)×12
a₁+24=518:6
a₁=⁵¹⁸/₆-¹⁴⁴/₆=³⁷⁴/₆=62⅓
a₁₂=a₁+11r
24=62⅓+11r
11r=24-62⅓
r=-38⅓:11=-¹¹⁵/₃×¹/₁₁=-115/33=-3¹⁶/₃₃= różnica
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S₁₂=½(a₁+a₁₂)×12
a₁+24=518:6
a₁=⁵¹⁸/₆-¹⁴⁴/₆=³⁷⁴/₆=62⅓
a₁₂=a₁+11r
24=62⅓+11r
11r=24-62⅓
r=-38⅓:11=-¹¹⁵/₃×¹/₁₁=-115/33=-3¹⁶/₃₃= różnica