m-4x-4xy-y =m-(4x+4xy+y)= m-(x+y)=(m+x+y)(m-x-y)1-m-n+2mn =1-(m+n-2mn)=1-(m-n)=(1+m-n)(1-m+n)4mn-4m+9-n=9-(n+m-4mn)=9-(m-n)=(3-m+n)(3+m-n)
因式分解-分组分解 1.m-4x-4xy-y 2.1-m-n+2mn 3.4mn-4m+9-n
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