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@9379992kjcz
August 2022
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найдите сумму первых членов арифметической прогрессии
x2=7, x4=-1
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mmb1
Verified answer
X2=x1+d=7
x4=x1+3d=-1
d=-4
x1=11
Sn=(a1+an)*n/2
S2=11+7=18
s3=7+3+11=21
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Answers & Comments
Verified answer
X2=x1+d=7x4=x1+3d=-1
d=-4
x1=11
Sn=(a1+an)*n/2
S2=11+7=18
s3=7+3+11=21