3√5-7-{√√2+[15√5-3(√5-4√√2)]:12}; d 4√6 +2√√2-16√√2-2(3√√2-2√√3)]; 16+3√7 [21√3-3-(7√√3+2√7)]; 13√2+2.{15√3-3.[12√√2-5(√2-√3)]}; g 180√5 +4√5 (18√2-3√5 (8√10-3(2√/10-√5)]}. ​