x³-3x²-2x+4如何分解因式?
2个回答
展开全部
x^3-3x^2-2x+4
=(x^3-x^2)+(-2x^2+2x)+(-4x+4)
=x^2(x-1)-2x(x-1)-4(x-1)
=(x-1)(x^2-2x-4)
=(x-1)(x-1-√5)(x-1+√5)
=(x^3-x^2)+(-2x^2+2x)+(-4x+4)
=x^2(x-1)-2x(x-1)-4(x-1)
=(x-1)(x^2-2x-4)
=(x-1)(x-1-√5)(x-1+√5)
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展开全部
x³-3x²-2x+4
=(x³-2x²+x)-(x²+3x-4)
=x(x²-2x+1)-(x+4)(x-1)
=x(x-1)²-(x+4)(x-1)
=(x-1)(x²-x-x-4)
=(x-1)(x²-2x-4)
=(x-1)(x-1-√5)(x-1+√5)
=(x³-2x²+x)-(x²+3x-4)
=x(x²-2x+1)-(x+4)(x-1)
=x(x-1)²-(x+4)(x-1)
=(x-1)(x²-x-x-4)
=(x-1)(x²-2x-4)
=(x-1)(x-1-√5)(x-1+√5)
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