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GlebMednik
@GlebMednik
July 2022
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(x-3)^3-x^3+9x^2=
(2x-3)*(2x+3)-(2x-5)^2=
Упростить!
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Answers & Comments
Androyoda
Первое уравнение:
(x-3)^3 раскладываем по формуле
x^3 -9x^2 +3^3x - 3^3 - x^3 + 9x^2 = 81x - 81
Второе:
Представим как (2x)^2 - 3^2 - (2x)^2 - 2*2x*5 + 5^2 = 4x^2 - 9 - 4x^2 - 20x +25 = 16 - 20x
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Answers & Comments
(x-3)^3 раскладываем по формуле
x^3 -9x^2 +3^3x - 3^3 - x^3 + 9x^2 = 81x - 81
Второе:
Представим как (2x)^2 - 3^2 - (2x)^2 - 2*2x*5 + 5^2 = 4x^2 - 9 - 4x^2 - 20x +25 = 16 - 20x