7 Розкладіть на множники вираз: 1-\frac{1}{27}y^{3} A (1-\frac{1}{3}y)(1-\frac{1}{3}y-\frac{1}{9}y^{2}) 5 (1-\frac{1}{3}y)(1+\frac{2}{3}y+\frac{2}{9}y^{2}) B (1-\frac{1}{3}y)(1+\frac{1}{3}y+\frac{1}{9}y^{2}) (1-\frac{1}{3}y)(1+\frac{1}{9}y+\frac{1}{27}y^{2}) д (1-\frac{1}{3}y)(2+\frac{2}{3}y+\frac{2}{9}y^{2})