Question

x^2y^2-4xy-x^2-y^2+1 разложить на множители

Answer 1

$x^2y^2-4xy-x^2-y^2+1=\ \ (x^2y^2-2xy+1)-(x^2+2xy+y^2)=\ \ (xy-1)^2-(x+y)^2=\ \ (xy-1+x+y)(xy-1-x-y)$