笨办法：将所有项式展开,则原式=x^4+10x^3+35x^2+50x=x(x^3+10x^2+35x+50)=x(x+5)(x^2+5x+10)或者,令x^2+5x=T则原式=（T+4)(T+6)-24=T^2+10T+24-24=T(T+10)=(x^2+5x)(x^2+5x+10)=x(x+5)(x^2+5x+10)...