根据韦达定理,x1+x2=-b/ax1*x2=c/a1)(x1-x2)^2=(x1+x2)^2-4x1*x2=b^2/a^2-4c/a|x1-x2|=|b^2/a^2-4c/a|(x1+x2)/2=-b/(2a)2)x1^3+x2^3=(x1+x2)(x1^2-x1*x2+x2^2)=(-b/a)[(x1+x2)^2-3x1*x2]=(-b/a)[(-b/a)^2-3*c/a]=(-b...