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World5
@World5
July 2022
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17 Баллов) Последний остался)
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evvoronina1
9-(2с-1)^2 =
= 3^2 - (2с-1)^2 =
= [3 -(2с-1)]•[3+(2с-1)] =
= (3-2с+1)(3+2с-1) =
= (4-2с)(2+2с) =
= 2(2-с)•2(1+с) =
= 4(2-с)(1+с)
Ответ: вариант 5
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Answers & Comments
= 3^2 - (2с-1)^2 =
= [3 -(2с-1)]•[3+(2с-1)] =
= (3-2с+1)(3+2с-1) =
= (4-2с)(2+2с) =
= 2(2-с)•2(1+с) =
= 4(2-с)(1+с)
Ответ: вариант 5