help. За 40 баллов, плз. Задания на фото.

1) m+kn-n-km= m(1-k)-n(1-k)= (1-k)(m-n)

2) y-by-3by+3b= y(y-b)-3b(y-b)= (y-b)(y-3b)

3) c(a-b)+(a-b)= (a-b)(c+1)

4) 8ab-7bc-14c+16ac= 8a(b-c)-7c(b-c)= (8a-7c)(b-c)(b+c)

5) an-am+cm-cn+bn-bm= a(n-m)-c(n-m)+b(n-m)= (n-m)(a-c+b)

6) 4a(4a-3)-4a(4a-3)+4a-3= (4a-3)(4a-4a+1)= (4a-3)(2a-1)= (4a-3)(2a-1)(2a-1)