\[\frac{1,4x^{5}}{y^{2}}\sqrt{\frac{y^{14}}{0,49x^{8}}};\ \ если\ y > 0\]
\[\frac{1,4x^{5}}{y^{2}}\sqrt{\frac{y^{14}}{0,49x^{8}}} = \frac{1,4x^{5}}{y^{2}} \cdot \frac{y^{7}}{0,7x^{4}} =\]
\[= 2xy^{5}\]