a^3-6a^2+12a-8因式分解怎么做?求详解

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a^3-6a^2+12a-8因式分解怎么做?求详解
a^3-6a^2+12a-8因式分解怎么做?求详解

a^3-6a^2+12a-8因式分解怎么做?求详解
a³-6a²+12a-8
=(a³-6a²+8a)+(4a-8)
=a(a²-6a+8)+4(a-2)
=a(a-2)(a-4)+4(a-2)
=(a-2)(a²-4a+4)
=(a-2)³

a^3-6a^2+12a-8
=(a^3-8)-(6a^2-12a)
=(a-2)(a^2+2a+4)-6a(a-2)
=(a-2)[(a^2+2a+4)-6a]
=(a-2)(a^2-4a+4)
=(a-2)^3

a^3-8-6a^2+12a=a^3-2^3-6a(a-2)=(a-2)(a^2+2a+4)-6a(a-2)=(a-2)(a^2-4a+4)=(a-2)^3

(a^3-8)-6a(a-2)=(a-2)(a^2+2a+4)-6a(a-2)=(a-2)(a^2-4a+4)=(a-2)(a-2)^2=(a-3)^3

=(a³-6a²+8a)+(4a-8)
=a(a²-6a+8)+4(a-2)
=a(a-2)(a-4)+4(a-2)
=(a-2)(a²-4a+4)
=(a-2)³

a³-b³=(a-b)(a²+ab+b²)
原式=(a-2)(a²+2a+4)-6a(a-2)
=(a-2)(a²+2a+4-6a)
=(a-2)(a²-4a+4)
=(a-2)(a-2)²
=(a-2)³