a^4-a^2+4a-4

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a^4-a^2+4a-4
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a^4-a^2+4a-4
a^4-a^2+4a-4

a^4-a^2+4a-4
【参考答案】

(a^4)-a²+4a-4
=a²(a²-1)+4(a-1)
=a²(a+1)(a-1)+4(a-1)
=(a-1)[a²(a+1)+4]
=(a-1)(a³+a²+4)

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a^4-a^2+4a-4
=a²(a²-1)+4(a-1)
=a²(a+1)(a-1)+4(a-1)
=(a-1)[a²(a+1)+4]
=(a-1)(a³+a²+4)

a^4-a^2+4a-4
=(a^4-a^2)+(4a-4)
=a^2(a^2-1)+4(a-1)
=a^2(a+1)(a-1)+4(a-1)
=(a-1)[a^2(a+1)+4]
=(a-1)(a^3+a^2+4)