题目内容
(1)计算:
+
+
-
+|1-
|
(2)求x的值:(2x-1)2=25.
| 3 | -27 |
| (-2)4 |
| 0 |
|
| 2 |
(2)求x的值:(2x-1)2=25.
(1)原式=-3+4+0-
+
-1
=
-
;
(2)两边开方得,2x-1=±5,解得x1=3,x2=-2.
| 1 |
| 2 |
| 2 |
=
| 2 |
| 1 |
| 2 |
(2)两边开方得,2x-1=±5,解得x1=3,x2=-2.
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