Выполните преобразование по соответствующей формуле: (5а-2)^2 (2х+9)^2 (6y-1)^2 ...

ratnikova2000 @ratnikova2000

July 2022 1 22 Report

Выполните преобразование по соответствующей формуле:
(5а-2)^2
(2х+9)^2
(6y-1)^2
Заранее спасибо

Answers & Comments

sebrithien

$\displaystyle \tt (5a-2)^2=(5a)^2-2\cdot5a\cdot2+2^2=\bold{25a^2-20a+4}\\\displaystyle \tt (2x+9)^2=(2x)^2-2\cdot2x\cdot9+9^2=\bold{4x^2-36x+81}\\\displaystyle \tt (6y-1)^2=(6y)^2-2\cdot6y\cdot1+1^2=\bold{36y^2-12y+1}$

Использованные формулы при решении:

$\displaystyle \tt (a-b)^2=a^2-2ab+b^2\\\displaystyle \tt (a+b)^2=a^2+2ab+b^2$

3 votes Thanks 6

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Answers & Comments

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