因式分解 m^2-4m+1=0
问题描述：
因式分解 m^2-4m+1=0
答
(m-2m)^2-3
答
m^2-4m+1=0
m^2-4m+4=3
(m-2)^2=3
m-2=根号3 或m-2=负根号3
m=2+根号3 或 m=2-根号3
答
(m-2)^2-3=0
(m-2-根号3)（m-2+根号3）=0
答
(m+2+2倍根号3)(m-2-2倍3)=0