yurij198 =[tex] \frac{1}{ \sqrt{ \frac{2x-1}{3} } }* \frac{2}{3} + \frac{1}{ \frac{2x+3}{5} } * \frac{2}{5} = \frac{2}{3 \sqrt{ \frac{2x-1}{3} } }+ \frac{2}{5\frac{2x+3}{5} }