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lesssiiia
а) 20b^2-245c^2=5(4b^2-49c^2)=5(2b-7c)(2b+7c)
б) 20a^3b-5ab^3=5ab(4a^2-b^2)=5ab(2a-b)(2a+b)
в) 1-m^4=(1+m^2)(1-m^2)=(1+m^2)(1-m)(1+m)

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