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3x^3-21x+18=0 ∴3x³;-3x-18x+18=0 即3x(x²;-1)-18(x-1)=0 ∴3x(x+1)(x-1)-18(x-1)=0 ∴x(x+1)(x-1)-6(x-1)=0 ∴(x-1)*[x(x+1)-6]=0 ∴(x-1)(x²;+x-6)=0 ∴(x-1)(x-2)(x+3)=0 ∴x=1或x=2或x=-3
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