5m-5n-mx+nx

1.5m-5n-mx+nx
=5(m-n)-x(m-n)
=(5-x)(m-n)

2.x^2-2bx-ax+2ab
=x(x-2b)-a(x-2b)
=(x-a)(x-2b)

3.6am+4an-3bm-2bn
=2a(3m+2n)-b(3m+2n)
=(2a-b)(3m+2n)

4.ax^2+bx^2-ay^2-by^2
=x^2(a+b)-y^2(a+b)
=(x^2-y^2)(a+b)
=(x+y)(x-y)(a+b)

1 (5-x)(m-n)
2 (x-2b)(x-a)
3 (2a-b)(3m+2n)
4 (a+b)(x-y)(x+y)

1)原式=(5-x)(m-n)
2)原式=(x-a)(x-2b)
3)原式=(2a-b)(3m+2n)
4)原式=(a+b)(x+y)(x-y)

1、(m-n)(5-x)
2、(x-a)(x-2b)
3、(3m+3n)(2a-b)
4、(a+b)(x+y)(x-y)