x^4-1-4x^2-4x怎么做
1个回答
x^4-1-4x^2-4x
=x⁴-(1+4x²+4x)
=x⁴-(1+2x)²
=(x²-1-2x)(x²+1+2x)
=(x²-2x-1)(x+1)²
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