题目内容
计算:
(1)
-
;
(2)
-
;
(3)
-
+
;
(4)
-
.
(1)
| 2 |
| x |
| 5 |
| x2 |
(2)
| a+1 |
| a-1 |
| a-1 |
| a+1 |
(3)
| x |
| y |
| y |
| x |
| x2+y2 |
| xy |
(4)
| 2 |
| x2-4 |
| 1 |
| 2x-4 |
(1)原式=
-
=
;
(2)原式=
=
;
(3)原式=
=
;
(4)原式=
=-
.
| 2x |
| x2 |
| 5 |
| x2 |
=
| 2x-5 |
| x2 |
(2)原式=
| (a+1)2-(a-1)2 |
| (a+1)(a-1) |
=
| 4a |
| (a-1)(a+1) |
(3)原式=
| x2-y2+x2+y2 |
| xy |
=
| 2x |
| y |
(4)原式=
| 4-(x+2) |
| 2(x+2)(x-2) |
=-
| 1 |
| 2(x+2) |
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