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Выполни умножение.

\(\dfrac{a}{b}\cdot \dfrac{c}{d}=\dfrac{ac}{bd}\) , \(\dfrac{a}{b}:\dfrac{c}{d}=\dfrac{ad}{bc}\) ;

\(b\ne 0\) , \(c\ne 0\) , \(d\ne 0\) .

1. \(\dfrac{x^2y}{z^3}\cdot \dfrac{z}{xy}=\dfrac{x^2y\cdot z}{z^3\cdot xy}=\) [ ].

2. \(\dfrac{2a^5b^8}{c^3d} \cdot \dfrac{ac^6}{6b^4d}=\) [ ].

3. \(\dfrac{5m^2}{3n}\cdot 15n^3=\dfrac{5m^2}{3n}\cdot \dfrac{15n^3}{1}=\) [ ].

4. \(18ab^2\cdot \dfrac{2a}{3b^5}=\) [ ].