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Кармон
@Кармон
May 2022
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Разность тридцатого и семнадцатого членов арифметической прогрессии (cn), если с10=-11, а c3=-32 (решите)
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Verified answer
C₃₀ - c₁₇ = c₁ + 29d - c₁ - 16d = 13d
c₁₀ = c₁ + 9d
c₃ = c₁ + 2d
____________
7d = 21
d = 3
c₃₀ - c₁₇ = 13 * 3 = 39
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Verified answer
C₃₀ - c₁₇ = c₁ + 29d - c₁ - 16d = 13dc₁₀ = c₁ + 9d
c₃ = c₁ + 2d
____________
7d = 21
d = 3
c₃₀ - c₁₇ = 13 * 3 = 39