题目内容
化简下列各式:
(1)
-
(2)
÷(1-2
)
(1)
| x-2+y-2 | ||||
x-
|
| x-2-y-2 | ||||
x-
|
(2)
a
| |||||||
a
|
| 3 |
| ||
(1)原式=
-
=(x-
)2-x-
•y-
+(y-
)2-[(x-
)2+x-
•y-
+(y-
)2]
=-2x-
•y-
.
(2)原式=
•
•a
=
=a.
(x-
| ||||
x-
|
(x-
| ||||
x-
|
=(x-
| 2 |
| 3 |
| 2 |
| 3 |
| 2 |
| 3 |
| 2 |
| 3 |
| 2 |
| 3 |
| 2 |
| 3 |
| 2 |
| 3 |
| 2 |
| 3 |
=-2x-
| 2 |
| 3 |
| 2 |
| 3 |
(2)原式=
a
| ||||||||
(a
|
a
| ||||
a
|
| 1 |
| 3 |
=
| a(a-8b) | ||||
(a
|
=a.
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