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1.
ab-a+b-1
=(ab-a)+(b-1)
=a(b-1)+(b-1)
=(a+1)(b-1)
2.
3m+nx-3n-mx
=(3m-3n)-(mx-nx)
=3(m-n)-x(m-n)
=(3-x)(m-n)
3.
题目有误,
xy-xz-y^2+2yz-z^2
=(xy-xz)-(y^2-2yz+z^2)
=x(y-z)-(y-z)^2
=(y-z)(x-y+z)
ab-a+b-1
=(ab-a)+(b-1)
=a(b-1)+(b-1)
=(a+1)(b-1)
2.
3m+nx-3n-mx
=(3m-3n)-(mx-nx)
=3(m-n)-x(m-n)
=(3-x)(m-n)
3.
题目有误,
xy-xz-y^2+2yz-z^2
=(xy-xz)-(y^2-2yz+z^2)
=x(y-z)-(y-z)^2
=(y-z)(x-y+z)
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