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rbcekz28
@rbcekz28
July 2022
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Сумма первых n членов арифметической прогрессии вычисляется по формуле 4n^2+3n. Найдите сумму членов прогрессии с восьмого по девятнадцатый включительно
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sedinalana
Verified answer
S=S(19)-S(7)=4*19²+3*19-4*7²-3*7=19*(4*19+3)-7(4*7+3)=
=19*(76+3)-7*(28+3)=19*79-7*31=1801-217=1284
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Verified answer
S=S(19)-S(7)=4*19²+3*19-4*7²-3*7=19*(4*19+3)-7(4*7+3)==19*(76+3)-7*(28+3)=19*79-7*31=1801-217=1284