\[\frac{3,5a^{15}}{b^{10}}\sqrt{\frac{b^{24}}{0,25a^{26}}},\ \ если\ a > 0\]
\[\frac{3,5a^{15}}{b^{10}}\sqrt{\frac{b^{24}}{0,25a^{26}}} =\]
\[= \frac{3,5a^{15} \cdot b^{12}}{b^{10} \cdot 0,5a^{13}} = 7a^{2}b^{2}\]