Диана140902 1) ax(px+qx)+b (py+qy)=ax (p+q)+by (p+q)=(p+q)(ax+by);
2) m(2x-y)-n (y-2x)=m (2x-y)+n (2x-y)=(2x-y)(m+n);
3) a (xy-7zy)-b (7yz-yx)=ay (x-7z)+by (x-7z)=(x-7z)(ay+by);