6.(ап)-арифметическая прогрессия. -23;-20… Найти S8. [3]. Created by valeragureev. matematika-ru

6.(ап)-арифметическая прогрессия. -23;-20… Найти S8. [3]...

valeragureev @valeragureev

October 2021 1 16 Report

6.(ап)-арифметическая прогрессия. -23;-20… Найти S8. [3]

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NNNLLL54

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Ответ:

$\{a_{n}\}:\ \ -23\ ;\ -20\ ;\ ...\\\\d=a_2-a_1=-20-(-23)=3\\\\a_8=a_1+7d=-23+7\cdot 3=-2\\\\S_8=\dfrac{a_1+a_8}{2}\cdot 8=\dfrac{-23-2}{2}\cdot 8=-25\cdot 4=-100$

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pri kakih znacheniyah h i u tochki a x 2 i v 8 u simmetrichny otnositelno na

parallelnyj perenos zadan formulami xx3yy 4najdite obraz tochki a 2 5

tochka o centr pravilnogo vosmiugolnika avsdefkm ukazhite obraz storony vs p

v ravnobedrennom treugolnike avsosnovanie ac i bokovaya storona absootvetstvenno

kakoj iz otrezkov mozhet byt obrazom otrezka 1 pri dvizhenii

ocenite vklad a bajtursynova v razvitii yazykoznaniya privedya ne menee treh argu

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