calculați: a) 3 radical 50 - radical 180 - radical 18 + radical 45 b) 5 radical din 27 - radical 125 + radical 80 - radical 12 c) radical 24 - 4 radical 45 + 3 radical 54 - 2 radical 80 d) radical 98 - radical 96 - 3 radical 150 - 7 radical 50 e) radical 108 - 8 radical 175 - 5 radical 48 + radical 63 f) - radical 242 + 7 radical 50 - 3 radical 28 + radical 63 dau coroanaaa