Автор - myrkkkjjjj

3.Разложите на множители

Ответ

Автор - karinaeralieva

1. Х-3у+х^2-9у^2

Х-3у+(х-3у)(х+3у)

(Х-3у)(1+х+3у)

2. 9m^2+6mn+n^2-25

(3m+n)^2-25

(3m+n-5)(3m+n+5)

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