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vasyuckovaver
@vasyuckovaver
July 2022
1
5
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НЕ ПРОХОДИТЕ МИМО. ДАЮ 20 БАЛЛОВ!!!! РЕШИТЕ
1.Сократите дробь: 3abc^8 / a^3bc^2
2.Докажите тождество: 2ab-(a+b)^2+2a^2=(a-b)(a+b)
3.решите уравнение: x^3+3x^2-9x-27=0
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Answers & Comments
MizoriesKun
1) 3abc⁸ / a³bc² = 3c⁶/a²
2) 2ab-(a+b)²+2a²=
2ab- a
²-2ab- b²+2a²=a²-b²=(a-b)(a+b)
3) x³+3x²
-9x-27=0
x
² (x+3)-9*(x+3)=0
(x+3)(x
²-9)=0 ⇒ (x+3)=0 (x²-9)=0
x=-3 x²=9 x=+/-3
Ответ: х=3, х=-3
4 votes
Thanks 4
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Answers & Comments
2) 2ab-(a+b)²+2a²=2ab- a²-2ab- b²+2a²=a²-b²=(a-b)(a+b)
3) x³+3x²-9x-27=0
x² (x+3)-9*(x+3)=0
(x+3)(x²-9)=0 ⇒ (x+3)=0 (x²-9)=0
x=-3 x²=9 x=+/-3
Ответ: х=3, х=-3