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superkukolka1
@superkukolka1
October 2021
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m11m
А) а₁=-3, d=1, а₆-?
а₆=а₁+d(n-1)
а₆=-3+1(6-1)
а₆=-3+5
а₆=2
в) а₁₇₀/а₂=15 а₂₁/а₁₂ -?
а₁₇₀=а₁+169d
а₂=а₁+d
а₁₇₀
=
а₁+169d
= 15
а₂ а₁+d
а₁+169d=15(а₁+d)
a₁+169d=15a₁+15d
154d=14a₁
a₁=11d
a₂₁=a₁+20d=11d+20d=31d
a₁₂=a₁+11d=11d+11d=22d
a₂₁
=
31d
=
31
a₁₂ 22d 22
Ответ: 31/22
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Answers & Comments
а₆=а₁+d(n-1)
а₆=-3+1(6-1)
а₆=-3+5
а₆=2
в) а₁₇₀/а₂=15 а₂₁/а₁₂ -?
а₁₇₀=а₁+169d
а₂=а₁+d
а₁₇₀ = а₁+169d = 15
а₂ а₁+d
а₁+169d=15(а₁+d)
a₁+169d=15a₁+15d
154d=14a₁
a₁=11d
a₂₁=a₁+20d=11d+20d=31d
a₁₂=a₁+11d=11d+11d=22d
a₂₁ = 31d = 31
a₁₂ 22d 22
Ответ: 31/22