Question

Разложи на множители: 1,4x^2+2,8xy+1,4y^2

Answer 1

$1.4x^2+2.8xy+1.4y^2= frac{7}{5} x^2+ frac{14}{5} xy+ frac{7}{5} y^2]= frac{7}{5} (x^2+2xy+y^2)$ =$frac{7}{5} (x+y)^2$