Выполни действия: 1)\dfrac{56x^3y^4}{z^5} \cdot \left(-\dfrac{z^4}{16x^2y^6}\right)= ; 2) \dfrac{72a^7}{c^{10}}:(24a^3c^8)= ; 3) \dfrac{6x-30}{x+8}:\dfrac{x^2-25}{2x+16}= ; 4) \dfrac{5x-10}{x^2+14x+49} \cdot \dfrac{4x+28}{x-2}= .

Задание

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Выполни действия:

\(\dfrac{56x^3y^4}{z^5} \cdot \left(-\dfrac{z^4}{16x^2y^6}\right)=\) [ \(\frac{7x}{2y^2z^2}\) | \(-\frac{7x}{2y^2z}\) | \(-\frac{7xy}{2y^2z}\) | \(-\frac{7y}{2x^2z}\) ];
\(\dfrac{72a^7}{c^{10}}:(24a^3c^8)=\) [ \(\frac{3a^4}{c^{18}}\) | \(3a^{10}c^{18}\) | \(\frac{3a^4}{c^2}\) | \(\frac{3a^{10}}{c^2}\) ];
\(\dfrac{6x-30}{x+8}:\dfrac{x^2-25}{2x+16}=\) [ \(\frac{12}{x+5}\) | \(\frac{12}{x-5}\) | \(\frac{12(x+8)}{x^2-25}\) | \(\frac{12(x+8)}{x+5}\) ];
\(\dfrac{5x-10}{x^2+14x+49} \cdot \dfrac{4x+28}{x-2}=\) [ \(\frac{20}{x-7}\) | \(\frac{28(x-2)}{x+7}\) | \(\frac{20(x+7)}{x-2}\) | \(\frac{20}{x+7}\) ].