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Surini
@Surini
August 2022
1
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1. n⁴-12n²+16
2. (a+b)(a-b)³-(a-b)(a+b)³
3. (a-b)²(a+b)^5+(a+b)²(a-b)^5
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математик2011
1.
= (n²)² - 2*4n²+4²-4n² = (n²-4)² - 4n² = (n²-4)² - (2n)² = (n²-4-2n)(n²-4+2n)
2.
=(a+b)(a-b)((a-b)² - (a+b)²) = (a+b)(a-b)(a-b-(a+b))(a-b+(a+b)) = (a-b)(a+b)(-2b)(2a) = -4ab(a²-b²)
3.
=(a-b)²(a+b)²((a+b)³+(a-b)³)=(a-b)²(a+b)²(a³+3a²b+3ab²+b³+3a²-3a²b+3ab²-b³)=(a-b)²(a+b)²(2a³+6ab²) = 2a(a-b)²(a+b)²(a²+3b²)
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Answers & Comments
= (n²)² - 2*4n²+4²-4n² = (n²-4)² - 4n² = (n²-4)² - (2n)² = (n²-4-2n)(n²-4+2n)
2.
=(a+b)(a-b)((a-b)² - (a+b)²) = (a+b)(a-b)(a-b-(a+b))(a-b+(a+b)) = (a-b)(a+b)(-2b)(2a) = -4ab(a²-b²)
3.
=(a-b)²(a+b)²((a+b)³+(a-b)³)=(a-b)²(a+b)²(a³+3a²b+3ab²+b³+3a²-3a²b+3ab²-b³)=(a-b)²(a+b)²(2a³+6ab²) = 2a(a-b)²(a+b)²(a²+3b²)