x(x+1)(x+2)=504
x(x+1)(x+2)=7×8×9
x1=7 ，x^3+3x^2+2x-504=0, x^3-7x^2+10x^2-70x+72x-504=0
(x-7)(x^2+10x+72)=0 x1=7, x2=-5+i根号（47）,x3==-5-ii根号（47）,
x*(x+1)*(x+2)=504
x(x^2+3x+2)-504=0
x^3+3x^2+2x-(7^3+3*7^2+2*7)=0
x^3-7^3+3x^2-3*7^2+2x-2*7=0
(x-7)(x^2+7x+49)+3(x-7)(x+7)+2(x-7)=0
(x-7)[(x^2+7x+49)+3(x+7)+2]=0
(x-7)(x^2+7x+49+3x+21+2)=0
(x-7)(x^2+10x+72)=0
(x-7)[(x^2+10x+25-25+72]=0
(x-7)[(x+5)^2+47]=0(因为(x+5)^2+47>0)
x-7=0
x=7
x*(x+1)*(x+2)=504=7*8*9
x=7
x(x+1)(x+2)=504
x(x+1)(x+2)=7×8×9
x=7
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