A.-a2+ab-ac= -a(a+b-c)
B.9xyz-6x2y2=3xyz(3-2xy)
C.3a2x-6bx+3x=3x(a2-2b)
D.xy2+ x2y= xy(x+y)
A.(a+3)(a-3)=a2-9
B.x2+x-5=(x-2)(x+3)+1
C.2b+ab2=ab(a+b)
D.x2+1=x(x+1 )
A.(A∩B)×(C∩D)=(A×C)∩(B×D)
B.(A∪B)×(C∪D)=(A×C)∪(B×D)
C.A×(B∪C)=(A×B)∪(A×C)
D.(A∩B)×C=(A×C)∩(B×C)