Предмет: Алгебра, автор: dashaYT168

2. Упростите выражение: a) (5x + 2)² - 20х б) 27x² - 3(3x - 1)2 в) (4x - 2y)² + 16ху г) 12x³ - 3(x³ + 2)2​

Ответы

Автор ответа: FWSERSQS
1

Ответ:

а)

\begin{align*}

(5x+2)^2-20x &= (25x^2+20x+4)-20x \

&= \boxed{25x^2+4}

\end{align*}

б)

\begin{align*}

27x^2 - 3(3x-1)^2 &= 27x^2 - 3(9x^2-6x+1) \

&= 27x^2 - 27x^2 + 18x - 3 \

&= \boxed{18x-3}

\end{align*}

в)

\begin{align*}

(4x-2y)^2+16xy &= 16x^2-16xy+4y^2+16xy \

&= \boxed{16x^2+4y^2}

\end{align*}

г)

\begin{align*}

12x^3 - 3(x^3+2)^2 &= 12x^3 - 3(x^6+4x^3+4) \

&= 12x^3 - 3x^6 - 12x^3 - 12 \

&= \boxed{-3x^6 - 12}

\end{align*}

Автор ответа: manyny06
1

Ответ:

решение смотри на фотографии

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