Question

把多项式ab(x-y)+(x-y)提取公因式后，剩下的因式是

1. A.
   ab
2. B.
   ab+1
3. C.
   a+1
4. D.
   b+1

Answer 1

B
ab(x-y)+(x-y)＝(x-y)(ab+1)，所以提取公因式后，剩下的因式是ab+1.选B.