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tvaschenkovv
@tvaschenkovv
August 2022
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В арифметической прогрессии an=3n-7. Найти сумму первых 30-ти членов. (С формулами пожалуйста )
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sangers1959
Verified answer
A1=3*1-7=3-7=-4
a2=3*2-7=6-7=-1
d=-1+4=3
S30=
1 votes
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Verified answer
A1=3*1-7=3-7=-4a2=3*2-7=6-7=-1
d=-1+4=3
S30=