题目内容
化简:1-
÷
=______.
| x+y |
| x-3y |
| x2-y2 |
| x2-6xy+9y2 |
1-
÷
=1-
•
=1-
=
=
.
| x+y |
| x-3y |
| x2-y2 |
| x2-6xy+9y2 |
| x+y |
| x-3y |
| (x-3y)2 |
| (x+y)(x-y) |
| x-3y |
| x-y |
| x-y-x+3y |
| x-y |
| 2y |
| x-y |
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•
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