问题
填空题
(1)
(2)
(3)
|
答案
(1)
=y x
,xy x2
(2)
=a+b ab
,a2+ab a2b
(3)
=x2+xy x2
,x+y x
故答案为:
,xy x2
,a2+ab a2b
.x+y x
(1)
(2)
(3)
|
(1)
=y x
,xy x2
(2)
=a+b ab
,a2+ab a2b
(3)
=x2+xy x2
,x+y x
故答案为:
,xy x2
,a2+ab a2b
.x+y x