Question

因式分解分组法1.ab-a+b-12.3m+nx-3n-mx3.xy-xz-y方-2yz-z方

Answer 1

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)