题目内容
(1)计算:
-
-
+6tan30°;
(2)解方程:2x2-5x+1=0.
| 12 |
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| 8 |
(2)解方程:2x2-5x+1=0.
(1)原式=2
-
-2
+6×
=4
-
;
(2)这里a=2,b=-5,c=1,
∵△=25-8=17,
∴x=
.
| 3 |
3
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| 2 |
| 2 |
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| 3 |
| 3 |
| 7 |
| 2 |
| 2 |
(2)这里a=2,b=-5,c=1,
∵△=25-8=17,
∴x=
5±
| ||
| 4 |
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