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dimaira
@dimaira
September 2021
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Упростите выражения? (a-9)в квадрате-(81+2а)
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2000914
(а-9)^2-(81+2a)=(a^2-2*a*9+9^2)-(81+2a)=a^2-18a+81-81-2a=a^2-18a-2a=a^2-20a=a(a-20)
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