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EvaW1
@EvaW1
June 2021
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найдите сумму первых семи членов геометрической прогрессии bn:-1;-1\2;… Помогите пожалуйста нужно Срочно^^
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marktuanlover
Q= 1/2
S7 = (b1*(1-q^n))/(1-q)
S7 = (-1 * (1-(1/2^7))/(1-1/2)= (- 127/128 ) / 0.5 = 1.9
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Answers & Comments
S7 = (b1*(1-q^n))/(1-q)
S7 = (-1 * (1-(1/2^7))/(1-1/2)= (- 127/128 ) / 0.5 = 1.9