Question

разложите на множители
использовать формулу (a-b)*(a+b) 18

Answer 1

$3y^5-\frac{3}{25}\, y^7=3\, y^5\cdot (1-\frac{1}{25}\, y^2)=3y^5\cdot (1-\frac{1}{5}\, y)(1+\frac{1}{5}\, y)=\\\\=3y^5\cdot \frac{5-y}{5}\cdot \frac{5+y}{5}=\frac{3}{25}\, y^5\cdot (5-y)(5+y)\\\\ili\\\\3y^5-\frac{3}{25}\, y^7=\frac{3}{25}\, (25\, y^5-y^7)=\frac{3}{25}\, y^5\cdot (25-y^2)=\frac{3}{25}\, y^5\cdot (5-y)(5+y)$

Answer 2

$3y^{5} *(1-\frac{y}{5})*(1+\frac{y}{5})$

Объяснение:

$3y^{5} - \frac{3}{25}y^{7}=3y^{5} *(1-\frac{y^{2} }{25})=3y^{5} *(1^{2} -(\frac{y}{5})^{2})=3y^{5} *(1-\frac{y}{5})*(1+\frac{y}{5})$