m^2-4mn+3n^2= 要用配方方法分解因式

m^2-4mn+3n^2= 要用配方方法分解因式


m^2-4mn+3n^2
=m^2-4mn+4n^2-n^2
=(m-2n)^2-n^2
=[(m-2n)+n][(m-2n)-n]
=(m-n)(m-3n)



m的平方-4mn+3n的平方
要求用配方公式


=m^2-4mn+4n^2-n^2
=(m-2n)^2-n^2
=(m-n)(m-3n)



m(3n-m)平方-3n(3n-m)平方+m-3n


m(3n-m)^2-3n(3n-m)^2+m-3n
=m(m-3n)^2-3n(m-3n)^2+(m-3n)
=(m-3n)^2(m-3n)+(m-3n)
=(m-3n)[(m-3n)^2+1]