题目内容
x=
,y=
,则(
)2+xy=______.
1-
| ||||
2 |
1+
| ||||
2 |
x2-y2 |
2 |
由已知得:x+y=1+
,x-y=-
,xy=
原式=[
]2+xy
=[
]2+
=
.
故本题答案为
.
3 |
2 |
1+
| ||
2 |
原式=[
(x+y)(x-y) |
2 |
=[
-
| ||||
2 |
1+
| ||
2 |
=
5+3
| ||
2 |
故本题答案为
5+3
| ||
2 |
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