II)Efetue: a) 3sqrt (5)+sqrt (5)-6sqrt (5)= b) 5sqrt [5](3)+2sqrt [5](3)-2sqrt [5](3)+sqrt [5](3)= c) sqrt (50)+sqrt (18)-sqrt (8)= d) 2sqrt [5](3)-2sqrt (3)+3sqrt (3)+3sqrt [5](3)= e) 2sqrt (27)-5sqrt (12)= f) sqrt (12)+sqrt (75)+sqrt (108)=

a) $3\sqrt{5} + \sqrt{5} - 6\sqrt{5} = -2\sqrt{5}$<br /><br />b) $5\sqrt[5]{3} + 2\sqrt[5]{3} - 2\sqrt[5]{3} + \sqrt[5]{3} = 6\sqrt[5]{3}$<br /><br />c) $\sqrt{50} + \sqrt{18} - \sqrt{8} = 5\sqrt{2} + 3\sqrt{2} - 2\sqrt{2} = 6\sqrt{2}$<br /><br />d) $2\sqrt[5]{3} - 2\sqrt{3} + 3\sqrt{3} + 3\sqrt[5]{3} = 5\sqrt[5]{3} + \sqrt{3}$<br /><br />e) $2\sqrt{27} - 5\sqrt{12} = 6\sqrt{3} - 10\sqrt{3} = -4\sqrt{3}$<br /><br />f) $\sqrt{12} + \sqrt{75} + \sqrt{108} = 2\sqrt{3} + 5\sqrt{3} + 6\sqrt{3} = 13\sqrt{3}$