Выбери верные ответы

Выполни умножение.

1. \(\dfrac{a^3b}{15c}\cdot \Big(-\dfrac{3c}{a^2b^2}\Big)=\) [ \(-\frac {a}{5b}\) | \(\frac {3a}{15b}\) | \(-5ab\) | \(\frac {5a}{b}\) ]
2. \(18y^3\cdot \dfrac{4x^2}{9y^5}=\) [ \(\frac {8x^2}{y^2}\) | \(\frac {72x^2}{9y^2}\) | \(8x^2y^2\) | \(\frac {24x^2}{3y^2}\) ]
3. \(\dfrac{a^{3n}b^{n+4}}{c^{n+3}}\cdot \dfrac{c^{2n+3}}{a^{2n}b^{n+1}}=\) [ \(b^3c^2\) | \(ab^3c^6\) | \(a^nb^3c^n\) | \(ac^{n+6}b^5\) ]