(1)3m(m-n)+6n(n-m)
=3（m+2n)(m-n)
(2)x(b+c-d)-y(d-b-c)-2c+2d-2b
=(b+c-d)(x+y-2)
(3)2(x-2)^2+5x-17
=2x^2-8x+8+5x-17
=2x^2-3x-9
不可分解
(4)ab-a-b-a
=ab-2a-b 不可分解了
5)x^3-3x^2+3x-1
=（x-1）^3
1 =3(m-n)(m-2n)
2 =(b+c-d)(x+y-2)
5 =(x-1)^3
3 =2x^2-3x-9
=(x-3)(2x+3)
1)3m(m-n)+6n(n-m)=3m(m-n）-6n(m-n)=3(m-n)(m-2n)
2)x(b+c-d)-y(d-b-c)-2c+2d-2b=x(b+c-d)+y(b+c-d)+2(b+c-d)=(b+c-d)(x+y+2)
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