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x^3+5x+18=0 x^3+2x^2-2x^2-4x+9x+18=0 x^2(x+2)-2x(x+2)+9(x+2)=0 (x+2)(x^2-2x+9)=0 (x+2)[(x-1)^2+8]=0 所以x+2=0,x=-2
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