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хадича12
@хадича12
August 2022
1
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упростите выражение и найдите его значение: а)2х(х-3)-х2степ(5-х)-(х3степ-3х2степ. +6х),х=-21/3 b) (а2степ. +4а+4) (а-2)-(а2степ -4а+4) (а+2), а=51/2
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Universalka
Verified answer
A) 2x(x - 3) - x²(5 - x) - (x³ - 3x² + 6x) = 2x² - 6x - 5x² + x³ - x³ + 3x² - 6x =
= - 12x
Если
то
б) (a² + 4a + 4)(a - 2) - (a² - 4a + 4)(a+2) = a³ - 2a² + 4a² - 8a + 4a - 8 - a³ -
- 2a² + 4a² + 8a- 4a - 8 = 4a² - 16
Если
то
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Answers & Comments
Verified answer
A) 2x(x - 3) - x²(5 - x) - (x³ - 3x² + 6x) = 2x² - 6x - 5x² + x³ - x³ + 3x² - 6x == - 12x
Если
б) (a² + 4a + 4)(a - 2) - (a² - 4a + 4)(a+2) = a³ - 2a² + 4a² - 8a + 4a - 8 - a³ -
- 2a² + 4a² + 8a- 4a - 8 = 4a² - 16
Если