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alinamuham2001
@alinamuham2001
July 2022
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Пожалуйста решите 6. Там на ариф. прогрес.
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moboqe
A1= -15, a(n+1)=an-10
a2=a1+d=a1-10= -25⇒d= -10
S8=n*(2a1+(n-1)d)/2=8(-30-70)/2=4(-100)= -400
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Answers & Comments
a2=a1+d=a1-10= -25⇒d= -10
S8=n*(2a1+(n-1)d)/2=8(-30-70)/2=4(-100)= -400