题目内容
计算
(1)20050-22+(
)-1
(2)
-
(3)
+
-
(4)
÷
.
(1)20050-22+(
| 1 |
| 3 |
(2)
| 3 |
| (x-1)2 |
| 3x |
| (x-1)2 |
(3)
| 4 |
| a2-4 |
| 2 |
| a+2 |
| 1 |
| a-2 |
(4)
| a2-1 |
| a2+2a+1 |
| a2-a |
| a+1 |
(1)原式=1-4+3
=0;
(2)原式=
=-
=-
;
(3)原式=
=
=
;
(4)原式=
•
=
.
=0;
(2)原式=
| 3-3x |
| (x-1)2 |
=-
| 3(x-1) |
| (x-1)2 |
=-
| 3 |
| x-1 |
(3)原式=
| 4+2(a-2)-(a+2) |
| (a+2)(a-2) |
=
| a-2 |
| (a+2)(a-2) |
=
| 1 |
| a+2 |
(4)原式=
| (a+1)(a-1) |
| (a+1)2 |
| a+1 |
| a(a-1) |
=
| 1 |
| a |
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