Ответ:
a₁=45 a₂₀=-25 S₂₀-?
S₂₀=(a₁+a₂₀)*n/2=(45+(-25))*20/2=20*10=200.
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Ответ:
a₁=45 a₂₀=-25 S₂₀-?
S₂₀=(a₁+a₂₀)*n/2=(45+(-25))*20/2=20*10=200.