Упрости выражения. \frac{5y^2-20y+20}{y^3-1}\cdot \frac{3y^2+3y+3}{10y-20}= . \frac{a^2-4b^2}{9a^2-b^2}\colon \frac{a^2+4ab+4b^2}{9a^2-6ab+b^2}= . \frac{(a^n+3b^n)^2-12a^nb^n}{a+b}\colon \frac{a^{2n}-9b^{2n}}{a^2-b^2}= .

Задание

Выбери верный ответ

Упрости выражения.

\(\frac{5y^2-20y+20}{y^3-1}\cdot \frac{3y^2+3y+3}{10y-20}=\)
[ \(\frac {3(y-2)}{2(y-1)}\) | \(\frac {3y-6}{y-1}\) | \(\frac {y-2}{2}\) ].
\(\frac{a^2-4b^2}{9a^2-b^2}\colon \frac{a^2+4ab+4b^2}{9a^2-6ab+b^2}=\)
[ \(\frac {3a^2-7ab+2b^2}{3a^2+7ab+2b^2}\) | \(-1\) | \(1\) ].
\(\frac{(a^n+3b^n)^2-12a^nb^n}{a+b}\colon \frac{a^{2n}-9b^{2n}}{a^2-b^2}=\)
[ \(\frac {(a^n-3b^n)(a-b)}{a^n+3b^n}\) | \(a-b\) | \(\frac {1}{a^n+3b^n}\) ].