Question

СРОЧНО!!!

РЕШИТЕ ПОЖАЛУЙСТА 4 НОМЕР!!!​

Answer 1

$x^2-9xy+8y^2=x^2+(-2xy-7xy)+8y^2=\\\\=(x^2-2xy+y^2)+(-7xy+7y^2)=(x-y)^2-7y\, (x-y)=\\\\=(x-y)(x-y-7y)=(x-y)(x-8y)$