Question

$x ^{2} y^{2} - \frac{4}{9}$
Разложите на множители: ​

Answer 1

$x^2y^2-\frac{4}{9}=(xy)^2-(\frac{2}{3})^2=(xy-\frac{2}{3})(xy+\frac{2}{3})\\\\\\\star \; \; a^2-b^2=(a-b)(a+b)\; \; \star$