因式分解1.4.5

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因式分解1.4.5

 

(x²-ax)²-4(x²-ax-1)
=(x²-ax)²-4(x²-ax)+4
=(x²-ax-2)²
6a^4-5a³-4a²
=a²(6a²-5a-4)
=a²(2a+1)(3a-4)
X^(n+1)-3X^n+2X(n-1)
=X^(n-1)(x²-3x+2)
=X^(n-1)(x-2)(x-1)