X3-3X2+4=0谁帮咱解的?
问题描述:
X3-3X2+4=0谁帮咱解的?
答
X3-3X2+4=0 x3+x-4x+4=0 x(x+1)-4(x-1)=0 x(x+1)-4(x+1)(x-1)=0 x(x+1)-(x+1)(4x-4)=0 (x+1)(x-4x+4)=0 (x+1)(x-2)=0 x=-1或x=2
X3-3X2+4=0谁帮咱解的?
X3-3X2+4=0 x3+x-4x+4=0 x(x+1)-4(x-1)=0 x(x+1)-4(x+1)(x-1)=0 x(x+1)-(x+1)(4x-4)=0 (x+1)(x-4x+4)=0 (x+1)(x-2)=0 x=-1或x=2