Question

разложить на множетили

Answer 1

Ответ:

${x}^{2} {y}^{2} - 1 = (xy - 1)(xy +1 )$

$25 - 36 {p}^{2} {c}^{2} = (5 - 6pc)(5 + 6pc)$

$4 - {c}^{2} {d}^{2} = (2 - cd)(2 + cd)$

$49 {x}^{2} {y}^{2} - 400 = \\ (7xy - 20)(7xy + 20)$