问题
解答题
(1)x-
(2)
|
答案
(1)原式=(x-y)-(
-x2-y2 x
)x2+y2 x
=(x-y)--2y2 x
=
-x-y x -2y2 x
=
;x2-xy+2y2 x
(2)原式=2(x+y) xy
+1 x 1 y
=2(x+y) xy y+x xy
=
•2(x+y) xy xy x+y
=2.
故答案为
、2.x2-xy+2y2 x
(1)x-
(2)
|
(1)原式=(x-y)-(
-x2-y2 x
)x2+y2 x
=(x-y)--2y2 x
=
-x-y x -2y2 x
=
;x2-xy+2y2 x
(2)原式=2(x+y) xy
+1 x 1 y
=2(x+y) xy y+x xy
=
•2(x+y) xy xy x+y
=2.
故答案为
、2.x2-xy+2y2 x