题目内容
(1)解方程:x2-2x-1=0.
(2)计算:(
-4
)-(3
-2
)
(3)计算:-42+|
-2|-(2002-
)0+
.
(2)计算:(
| 48 |
|
|
| 0.5 |
(3)计算:-42+|
| 2 |
| 3 |
| 1 | ||
1+
|
(1)x2-2x-1=(x-1)2-2=0,
∴x-1=±
,
∴x1=1+
;x2=1-
;
(2)(
-4
)-(3
-2
)
=4
-
-
+
=3
;
(3)-42+|
-2|-(2002-
)0+
=-16+(2-
)-1+
=-16+2-
-1-(1-
)
=-16
∴x-1=±
| 2 |
∴x1=1+
| 2 |
| 2 |
(2)(
| 48 |
|
|
| 0.5 |
=4
| 3 |
| 2 |
| 3 |
| 2 |
=3
| 3 |
(3)-42+|
| 2 |
| 3 |
| 1 | ||
1+
|
=-16+(2-
| 2 |
1-
| ||||
(1+
|
=-16+2-
| 2 |
| 2 |
=-16
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