пж решите дам 25 пиров , Все не считая 2 и 6

267.
1) ac-ad+c-cd-bc+bd=(ac-ad)+(c-cd)-(bc-bd)=
    =a(c-d)+c(c-d)-b(c-d)=(c-d)(a+c-b)

3) am+cm-an+an-cn+cn=(am+cm)-(an+cn)+(an+cn)=
    =m(a+c)-n(a+c)+n(a+c)=(a+c)(m-n+n)=(a+c)(m+n-n)

4) xy-ny-mx+mn+mx-mn=(xy-ny)-(mx-mn)+(mx-mn)=
    =y(x-n)-m(x-n)+m(x-n)=(x-n)(y-m+m)=(x-n)(m+y-m)

5) ab+a+ab+b+2ab+2=(ab+ab+2ab)+(a+b+2)=
    =ab(a+b+2)+(a+b+2)=(a+b+2)(ab+1)
    

1) ac-ad+c+cd+bc+bd = (ac+c-bc) - (ad+cd-bd)= c*(a+c-b) - d(a+c-b)=

=(c-d)*(a+c-b)

3) am+cm-an+an-cn+cn= m*(a+c) - n*(a+c)+ n*(a+c)=(m-n+n)* (a+c)

4) xy-ny+mx+mn+mx-mn=y*(x-n) - m*(x-n)+ m*(x-n)= (y-m+m)*(x-n)

5) ab + a+ab + b+ 2ab+2 =a(ab+1)+b(ab+1)+2(ab+1)= (a+b+2)(ab+1)

6) x-xy+x-xy+y-y = x*(x-y+1) - y*(x-y+1) = (x-y+1)* (x-y)