x^3+12x^2+36x+36=0

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x^3+12x^2+36x+36=0x^3+12x^2+36x+36=0x^3+12x^2+36x+36=0可划为x(x^2+12x+36)+36=0,x(x+6)^2=-36,所以x

x^3+12x^2+36x+36=0
x^3+12x^2+36x+36=0

x^3+12x^2+36x+36=0
可划为x(x^2+12x+36)+36=0,x(x+6)^2=-36,所以x