-x³+3x+2因式分解是多少?
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-x³+3x+2
=-x³+3x+3-1
=(-x³-1)+(3x+3)
=-(x+1)(x²+x+1)+3(x+1)
=(x+1)(-x²-x-1+3)
=(x+1)(-x²-x+2)
=-(x+1)(x²+x-2)
=-(x+1)(x-1)(x+2)
=-x³+3x+3-1
=(-x³-1)+(3x+3)
=-(x+1)(x²+x+1)+3(x+1)
=(x+1)(-x²-x-1+3)
=(x+1)(-x²-x+2)
=-(x+1)(x²+x-2)
=-(x+1)(x-1)(x+2)
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