Tính \(\sqrt[3]{{54x{y^3}}} - y\sqrt[3]{{128x}}\)

* Hướng dẫn giải

 \(\begin{array}{l}\;\sqrt[3]{{54x{y^3}}} - y\sqrt[3]{{128x}}\\ = \sqrt[3]{{{{2.3}^3}x{y^3}}} - y\sqrt[3]{{{{2.4}^3}x}}\\ = 3y\sqrt[3]{{2x}} - 4y\sqrt[3]{{2x}}\\ = - y\sqrt[3]{{2x}}\end{array}\)