Thu gọn biểu thức: c) 1/ 2 x y ( x ^5 − y ^3 ) − x^ 2 y ( 1/ 4 x ^4 − y^ 3 ) ;

c) \(\frac{1}{2}xy\left( {{x^5} - {y^3}} \right) - {x^2}y\left( {\frac{1}{4}{x^4} - {y^3}} \right)\)

\( = \frac{1}{2}xy \cdot {x^5} - \frac{1}{2}xy \cdot {y^3} - {x^2}y \cdot \frac{1}{4}{x^4} + {x^2}y \cdot {y^3}\)

\( = \frac{1}{2}{x^6}y - \frac{1}{2}x{y^4} - \frac{1}{4}{x^6}y + {x^2}{y^4}\)

\( = \left( {\frac{1}{2}{x^6}y - \frac{1}{4}{x^6}y} \right) - \frac{1}{2}x{y^4} + {x^2}{y^4}\)

\[ = \frac{1}{4}{x^6}y - \frac{1}{2}x{y^4} + {x^2}{y^4}\]