题目内容
计算:
(1)
+
÷
;
(2)
-
(
-x+1).
(1)
| a |
| a2-2a |
| 1 |
| 3-a |
| 2-a |
| 9-a2 |
(2)
| 1 |
| x |
| 1 |
| x-1 |
| x2-1 |
| x |
(1)原式=
+
•
=
+
=
-
=-
;
(2)原式=
-
•
+
(x-1)
=
-
+1=
+1
=0.
| a |
| a(a-2) |
| 1 |
| 3-a |
| (3+a)(3-a) |
| 2-a |
=
| 1 |
| a-2 |
| 3+a |
| 2-a |
=
| 1 |
| a-2 |
| a+3 |
| a-2 |
=-
| a+2 |
| a-2 |
(2)原式=
| 1 |
| x |
| 1 |
| x-1 |
| x2-1 |
| x |
| 1 |
| x-1 |
=
| 1 |
| x |
| x+1 |
| x |
| 1-x-1 |
| x |
=0.
练习册系列答案
相关题目