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

\begin{equation}\frac{9x}{x-10} \times \frac{3(x-10)}{8x}\end{equation}

\begin{equation}\frac{x+9}{x+8} \times \frac{x+8}{x+8}\end{equation}

\begin{equation}\frac{5(x+7)}{x+3} \times \frac{5(x+3)}{5}\end{equation}

\begin{equation}\frac{16x^{2}}{21} \times \frac{3}{64x^{5}}\end{equation}

\begin{equation}\frac{100}{10(x+8)} \times \frac{3(x+8)}{50}\end{equation}

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

\begin{equation}\frac{7x}{100x^{2}-1} \times \frac{10x^{2}+51x+5}{49}\end{equation}

\begin{equation}\frac{2(x+4)}{x^{2}+13x+36} \times (x+9)(x+8)\end{equation}

\begin{equation}\frac{14x^{2}y^{5}}{x^{3}} \times \frac{10x^{2}}{7y}\end{equation}

\begin{equation}\frac{49x^{2}}{16} \times \frac{2}{343x^{5}}\end{equation}

\begin{equation}\frac{9}{4(x+5)} \times (x^{2}+14x+45)\end{equation}

\begin{equation}\frac{9(x+5)}{9} \times \frac{45x}{x+5}\end{equation}

\begin{equation}\frac{9x^{2}+xy^{3}}{y^{3}} \times \frac{6(xy+3y)}{x^{2}+3x}\end{equation}