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1. \(\dfrac{18m^3n^4}{25p^6q^{10}} \colon \Big(-\dfrac{4m^2n^9}{75p^5q^{12}}\Big)=\)
   [ \(-\frac {27mq^2}{2pn^5}\) | \(-\frac {9mn^5q^2}{2p}\) | \(-\frac {24mn^5}{50pq^2}\) ];
2. \(\dfrac{4x^4y^3}{49z^9}\colon \Big(16x^7y^8\Big)=\)
   [ \(\frac {1}{196x^3y^5z^9}\) | \(\frac {64(xy)^{11}}{49z^9}\) | \(\frac {x^3y^5}{196z^9}\) ].