Question

x3+x2+x-3=0的根的情况是

Answer 1

x^3+x^2+x-3=0,

x^3-x^2+2x^2+x-3=0,

x^2(x-1)+(x-1)(2x+3)=0,

(x-1)(x^2+2x+3)=0,

x^2+2x+3≠0,x-1=0,

x=1.