N⁵ - (n - 1)²(n³ + 2n² + 3n + 4) = n⁵ - (n² - 2n + 1)(n³ + 2n² + 3n + 4) =
= n⁵ - n⁵ - 2n⁴ - 3n³ - 4n² +2n⁴ + 4n³ + 6n² + 8n - n³ - 2n² - 3n - 4 =
= 5n - 4
<span>г)у=-4 при х=1
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(a²-9b²)/(0,5a+1,5b)=(a²-(3b)²)/(0,5a+1,5b)=2*(a2-(3b)²)/(2*(0,5a+1,5b))=
=2*(a+3b)(a-3b)/(a+3b)=2*(a-3b)=2a-6b=1.