题目内容
解方程:(1)x2+4x+2=0
(2)-2-2+
+(π-3.14)0-
cos30°
(2)-2-2+
| (-3)2 |
| 12 |
(1)∵△=16-8=8,
∴x=
,
x1=-2+
,x2=-2-
;
(2)-2-2+
+(π-3.14)0-
cos30°,
=-
+3+1-2
×
,
=
.
∴x=
-4±2
| ||
| 2 |
x1=-2+
| 2 |
| 2 |
(2)-2-2+
| (-3)2 |
| 12 |
=-
| 1 |
| 4 |
| 3 |
| ||
| 2 |
=
| 3 |
| 4 |
练习册系列答案
相关题目