2.5
1/42
Пошаговое объяснение:
а)=√1.2*3.7*√3.7/1.2-√1.2*3.7*√1.2/3.7=√1.2*3.7*3.7/1.2-√1.2*3.7*1.2/3.7=
=√(3.7)²-√(1.2)²=3.7-1.2=2.5
b)=√7/6:√42-√6/7:√42=√7/6:√7*6-√6/7:√7*6=√7/6*1/7*6-√6/7*1/7*6=
=√1/36-√1/49=1/6-1/7=7/42-6/42=1/42
/-черта дроби
