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sostavkina2000
@sostavkina2000
July 2022
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помогите решить арифметическую прогрессию
S₁₄-?
a₁=-63
a₂=-58
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Pacanka202
D=a2–a1=–58+63=5
2a1+13d
S14 = ------------ • 14 = (2a1+13d)•7 =
2
= (2•(-63)+13•5)•7 = (-126+65)•7 =-427
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Answers & Comments
2a1+13d
S14 = ------------ • 14 = (2a1+13d)•7 =
2
= (2•(-63)+13•5)•7 = (-126+65)•7 =-427