​Tính: 27^3/3^2

​Tính

​ 27^3÷3^2
(3/5)^15÷(9/25)^5
120^3/40^3
Tìm x
(2x+3)^2=9
(4x-3)^2=4
(X+1)^3=-27
(2x+1)^3=-64