\begin{equation}\frac{4x^{2}}{8} \times \frac{8}{x}\end{equation}

\begin{equation}\frac{10x}{x-4} \times \frac{7(x-4)}{5x}\end{equation}

\begin{equation}\frac{x+4}{x+4} \times \frac{x+4}{x+4}\end{equation}

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

\begin{equation}\frac{16x^{2}}{90} \times \frac{10}{64x^{5}}\end{equation}

\begin{equation}\frac{15}{9(x+7)} \times \frac{6(x+7)}{25}\end{equation}

\begin{equation}\frac{x+7}{8(x+4)} \times \frac{x+4}{x^{2}+17x+70}\end{equation}

\begin{equation}\frac{10x}{36x^{2}-1} \times \frac{6x^{2}+31x+5}{100}\end{equation}

\begin{equation}\frac{8(x+3)}{x^{2}+5x+6} \times (x+2)(x+5)\end{equation}

\begin{equation}\frac{36x^{2}y^{5}}{x^{3}} \times \frac{5x^{2}}{6y}\end{equation}

\begin{equation}\frac{9x^{2}}{18} \times \frac{3}{27x^{5}}\end{equation}

\begin{equation}\frac{9}{3(x+7)} \times (x^{2}+17x+70)\end{equation}

\begin{equation}\frac{5(x+6)}{3} \times \frac{27x}{x+6}\end{equation}

\begin{equation}\frac{10x^{2}+xy^{3}}{y^{3}} \times \frac{9(xy+10y)}{x^{2}+10x}\end{equation}