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chernowadarina
@chernowadarina
July 2022
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В арифметической прогрессии –3; 2; 7… найдите сумму первых
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sedinalana
Verified answer
A,=-3 a2=2
d=a2-a1=3+2=5
S16=(2a1+15d)*16/2=(-6+75)*8=69*8=552
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Answers & Comments
Verified answer
A,=-3 a2=2d=a2-a1=3+2=5
S16=(2a1+15d)*16/2=(-6+75)*8=69*8=552