题目内容
直接写出结果:(1)1-
•
=______;
(2)a+
÷
=______.
| 1 |
| 1-x |
| x-1 |
| x |
(2)a+
| 1 |
| a-b |
| a+b |
| a-b |
(1)1-
•
=1+
=
;
(2)a+
÷
=a+
•
=a+
=
.
| 1 |
| 1-x |
| x-1 |
| x |
=1+
| 1 |
| x |
=
| x+1 |
| x |
(2)a+
| 1 |
| a-b |
| a+b |
| a-b |
=a+
| 1 |
| a-b |
| a-b |
| a+b |
=a+
| 1 |
| a+b |
=
| a2+ab+1 |
| a+b |
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