rasionalkanlah √60y^5/√4y

√60y⁵     √4y       √(60y⁵. 4y)
-------  x -------- = ------------------
√4y        √4y             4y
                           √(240y⁶)
                        = ------------
                               4y
                            y³√(16.15)
                        = ---------------
                                4y
                            4y³ √15
                        = -----------
                               4y
                        = y²√15