题目内容
计算:(
+
)•
÷(
+
)
| x |
| x+y |
| 2y |
| x+y |
| xy |
| x+2y |
| 1 |
| x |
| 1 |
| y |
原式=
•
÷
=
•
•
=
.
| x+2y |
| x+y |
| xy |
| x+2y |
| x+y |
| xy |
=
| x+2y |
| x+y |
| xy |
| x+2y |
| xy |
| x+y |
=
| x2y2 |
| (x+y)2 |
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