В) ax-bx-x +ay-by-y = x(a-b-1) +y(a-b-1) = (x+y)(a-b-1)
г)2a² -a +2ab -b -2ac+c = a(2a-1) + b(2a-1) - c(2a-1) =
= (2a-1)(a+b-c)
е) px²+qx +q²y +pqxy +p²qx+pq²=
= (px² +pqxy +p²qx) + (qx +q²y +pq²) =
= px(x+qy +pq) + q(x+qy +pq) =
= (px+q) (x+qy +pq)
д) ab-ac +5b -5c = a(b-c) +5(b-c) = (a+5)(b-c)
a) xy -xz -y +z = x(y-z) +(z-y) = -x(z-y) +1(z-y) =
= (-x+1)(z-y)
ж) km -k -2m+2 = k (m-1) -2(m-1) = (k-2)(m-1)