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karinamaman
@karinamaman
September 2021
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Помогите пожалуйста,с решением
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belozerova1955
Verified answer
Аn=а₁+d(n-1)
a₁₀= -4+6(10-1)= -4+54 = 50
Sn=(a₁+an)·n/2
S₁₀=(-4+50)·10/2= 230
Ответ: (1)
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Answers & Comments
Verified answer
Аn=а₁+d(n-1)a₁₀= -4+6(10-1)= -4+54 = 50
Sn=(a₁+an)·n/2
S₁₀=(-4+50)·10/2= 230
Ответ: (1)