1-m^2+4mn-4n^2

来源:学生作业帮助网 编辑:六六作业网 时间:2024/11/25 00:38:16
1-m^2+4mn-4n^21-m^2+4mn-4n^21-m^2+4mn-4n^21-m^2+4mn-4n^2=1-(m^2-4mn+4n^2)=1-(m-2n)^2=(1-m+2n)(1+m-2n

1-m^2+4mn-4n^2
1-m^2+4mn-4n^2

1-m^2+4mn-4n^2
1-m^2+4mn-4n^2
=1-(m^2-4mn+4n^2)
=1-(m-2n)^2
=(1-m+2n)(1+m-2n)

1-m^2+4mn-4n^2
=1-(m^2-4mn+4n^2)
=1-(m-2n)^2
=[1+(m-2n)][1-(m-2n)]