докажите 2+4+6+...+2n=2n+n(n-1). Created by kerimovaaliya36. algebra-ru

докажите 2+4+6+...+2n=2n+n(n-1)...

kerimovaaliya36 @kerimovaaliya36

July 2022 1 5 Report

докажите 2+4+6+...+2n=2n+n(n-1)

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sangers1959

Verified answer

Объяснение:

$2+4+6+...+2n=2n+n*(n-1)\ \ \ \ a_1=2\ \ \ \ a_n=2n\\S_n=\frac{a_1+a_n}{2}*n=\frac{2+2n}{2}*n=\frac{2*(1+n)}{2}*n=(1+n)*n=n+n^2=\\=n+n^2+n-n=2n+n^2-n=2n+n*(n-1).$

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Verified answer

4 esli rasstoyanie ot obektiva kondensatora do izobrazheniya sostavlyaet 80 sm a

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esli sootnoshenie atomnogo otnosheniya fosfora k kislorodu sostavlyaet 2 3 i 2 5

predlozhenie po sheme ap78d4e9b9ef9e4343f0de2cd1b1b323db 93307

texpomogite096df3fd787f2c9827c1a54faaa12073 85071

detalnaya informaciya teksta chto eto takoe

a 2 butylki pitevoj vody byli dostavleny v kazhduyu iz 7 komnat skolko butylok

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