题目内容
计算:
(1)
-
=______;
(2)
+
-
=______;
(3)
-
=______;
(4)
+
=______.
(1)
| 3a |
| 3a-2b |
| 2b |
| 3a-2b |
(2)
| a+2b |
| a-b |
| b |
| b-a |
| 2a |
| a-b |
(3)
| x |
| (x-1)2 |
| 1 |
| (x-1)2 |
(4)
| x2-1 |
| x2+2x+1 |
| 2 |
| x+1 |
(1)原式=
=1;
(2)原式=
=
=-1;
(3)原式=
=
;
(4)原式=
+
=
=
=1.
故答案为:(1)1;(2)-1;(3)
;(4)1
| 3a-2b |
| 3a-2b |
(2)原式=
| a+2b-b-2a |
| a-b |
| -(a-b) |
| a-b |
(3)原式=
| x-1 |
| (x-1)2 |
| 1 |
| x-1 |
(4)原式=
| (x+1)(x-1) |
| (x+1)2 |
| 2 |
| x+1 |
| x-1+2 |
| x+1 |
| x+1 |
| x+1 |
故答案为:(1)1;(2)-1;(3)
| 1 |
| x-1 |
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