22 Efetue. a) 3sqrt (5)+sqrt (5)-6sqrt (5) 22. a) -2sqrt (5) b) 4sqrt (2)+6sqrt (3)-2sqrt (2)+9sqrt (3) 22. b) 2sqrt (2)+15sqrt (3) c) 2sqrt [5](3)-2sqrt (3)+3sqrt (3)+3sqrt [5](3) 22. c) 5sqrt [5](3)+sqrt (3) d) 3+sqrt (2)+7-5sqrt (2) 22. d) 10-4sqrt (2)

a) $3\sqrt{5} + \sqrt{5} - 6\sqrt{5} = -2\sqrt{5}$<br /><br />b) $4\sqrt{2} + 6\sqrt{3} - 2\sqrt{2} + 9\sqrt{3} = 2\sqrt{2} + 15\sqrt{3}$<br /><br />c) $2\sqrt[5]{3} - 2\sqrt{3} + 3\sqrt{3} + 3\sqrt[5]{3} = 5\sqrt[5]{3} + \sqrt{3}$<br /><br />d) $3 + \sqrt{2} + 7 - 5\sqrt{2} = 10 - 4\sqrt{2}$