Разложите на множители многочлен na+nb+5a+5b=? , 7x-7y+bx-by=? , 10a-by+10b-ay =? , pq-x-px+q=? , b-a-ab+1=? , 2cx-cy-6x+3y=? , 15ax-14by+10bx-21ay =? ,56pq-1-7q+8p=?

1)na+nb+5a+5b=n(a+b)+5(a+b)=(a+b)(n+5)
2)7x-7y+bx-by=7(x-y)+b(x-y)=(x-y)(7+b)
3)10a-by+10b-ay=10(a+b)-y(a+b)=(a+b)(10-y)
4)pq-x-px+q=q(p+1)-x(1+p)=(1+p)(q-x)
5)b-a-ab+1=(b+1)-a(1+b)=(1+b)(1-x)
6)2cx-cy-6x+3y=2x(c-3)-y(c-3)=(c-3)(2x-y)
7)15ax-14by+10bx-21ay=5x(3a+2b)-7y(2b+3a)=(3a+2b)(5x-7y)
8)56pq-1-7q+8p=8p(7q+1)-(1+7q)=(7q+1)(8p-1)