题目内容
(1)化简:
-
-
+(
-2)0+
;
(2)解方程:x2+4x-1=0.
| 18 |
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| 3 |
(1-
|
(2)解方程:x2+4x-1=0.
(1)
-
-
+(
-2)0+
=3
-
-
+1+
-1
=
-1;
(2)x2+4x-1=0,
x2+4x=1,
x2+4x+4=1+4.
(x+2)2=5,
x+2=±
,
x1=-2+
,x2=-2-
.
| 18 |
|
| ||||
|
| 3 |
(1-
|
=3
| 2 |
| 3 |
| 2 |
| 2 |
3+3
| ||
| 3 |
| 2 |
=
3
| ||
| 2 |
(2)x2+4x-1=0,
x2+4x=1,
x2+4x+4=1+4.
(x+2)2=5,
x+2=±
| 5 |
x1=-2+
| 5 |
| 5 |
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