4/9а^2в^2-2 7/9х^2у^2решите подробно

Question

4/9а^2в^2-2 7/9х^2у^2
решите подробно

Answer 1

4/9=(2/3)^2 ; 2 7/9=25/9=(5/3)^2 

(2/3ab)^2-(5/3xy)^2=(2/3ab+1 2/3xy)*(2/3ab-1 2/3xy)