15 БАЛЛОВ!)
Г) (2x+3y)^2-5xy
Д) 60ab-(4a+7b)^2
Е)-(5s^2-2t^2)^2-20s^2t^2
Д)(2a+b)(2a-b)
Е) (x-3y)(x+3y)
Ж)(7z+3t)(7z-3t)
ЗАРАНЕЕ СПАСИБО!)
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