题干

分解因式:xyxy+1+xy+3-2x+y+
1
2
-x+y-12

上一题 下一题 0.0难度 选择题 更新时间:2016-07-25 07:33:21

答案(点此获取答案解析)

解:原式=(xy)2+2xy+3﹣2(x+y)﹣1﹣(x+y)2+2(x+y)﹣1,
=(xy)2+2xy+1﹣(x+y)2
=(xy+1)2﹣(x+y)2
=(xy+1+x+y)(xy+1﹣x﹣y),
=(x+1)(y+1)(x﹣1)(y﹣1)