\begin{equation}\frac{9x^{2}}{4} \times \frac{9}{x}\end{equation}

\begin{equation}\frac{2x}{x-4} \times \frac{9(x-4)}{8x}\end{equation}

\begin{equation}\frac{x+3}{x+10} \times \frac{x+10}{x+10}\end{equation}

\begin{equation}\frac{3(x+9)}{x+7} \times \frac{8(x+7)}{3}\end{equation}

\begin{equation}\frac{81x^{2}}{18} \times \frac{3}{729x^{5}}\end{equation}

\begin{equation}\frac{64}{6(x+8)} \times \frac{10(x+8)}{80}\end{equation}

\begin{equation}\frac{x+2}{2(x+3)} \times \frac{x+3}{x^{2}+10x+16}\end{equation}

\begin{equation}\frac{3x}{25x^{2}-1} \times \frac{5x^{2}+46x+9}{24}\end{equation}

\begin{equation}\frac{10(x+3)}{x^{2}+7x+12} \times (x+4)(x+6)\end{equation}

\begin{equation}\frac{56x^{2}y^{5}}{x^{3}} \times \frac{5x^{2}}{3y}\end{equation}

\begin{equation}\frac{100x^{2}}{15} \times \frac{3}{1000x^{5}}\end{equation}

\begin{equation}\frac{9}{5(x+2)} \times (x^{2}+6x+8)\end{equation}

\begin{equation}\frac{8(x+9)}{7} \times \frac{56x}{x+9}\end{equation}

\begin{equation}\frac{3x^{2}+xy^{3}}{y^{3}} \times \frac{5(xy+7y)}{x^{2}+7x}\end{equation}