Объяснение:
(a-3y)² : (9y²-a²)/16x =
=(a-3y)²/12y * 16x/(3y+a)(3y-a)=
=-4x(a-3y)/3y(a+3y)= (-4ax+12xy)/(3ay+9y²) = (12xy-4ax)/(3ay+9y²)
OTBET:2
2.
V=1/3a²h / *3
3V=a²h // :h
a²=3V/h
a=√(3V/h)
