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dubovik1999
@dubovik1999
July 2022
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найдите сумму восемнадцати первых членов арифметической прогрессии 7; 11; 15
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Lesben
D=a2-a1=a3-a2=a4-a3=-------. d=11-7=4, d=4
a18=a1+17.4=7+68=75
s18=18/2(a1+a18)=9(7+75)=9.82=738
s18=738
5 votes
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a18=a1+17.4=7+68=75
s18=18/2(a1+a18)=9(7+75)=9.82=738
s18=738