计算:(x2-2x+1-y2)÷(x+y-1)= ___ .

1个回答

  • 解题思路:先对(x2-2x+1-y2)进行因式分解得:(x2-2x+1-y2)=(x-1+y)(x-1-y),再去相除得即可求出结果.

    (x2-2x+1-y2)÷(x+y-1),

    =(x-1+y)(x-1-y)÷(x+y-1),

    =x-y-1.

    故应填:x-y-1.

    点评:

    本题考点: 整式的除法.

    考点点评: 主要考查多项式除法运算,先把被除式进行因式分解是解题的关键,也是难点.