题目内容
(1)计算:
+
-(
-1)0;
(2)计算:
•tan60°;
(3)解方程:x(x+8)=16.
| 2 | ||
|
| 27 |
| 3 |
(2)计算:
| 1+cos30° |
| sin60° |
(3)解方程:x(x+8)=16.
(1)
+
-(
-1)0=
+1-3
-1=-2
;
(2)
•tan60°=
×
=(2+
)×
=2
+3;
(3)x(x+8)=16
x2+8x=16,
x2+8x+16=16+16,
(x+4)2=32,
x+4=±4
,
x1=-4+4
,x2=-4-4
.
| 2 | ||
|
| 27 |
| 3 |
| 3 |
| 3 |
| 3 |
(2)
| 1+cos30° |
| sin60° |
1+
| ||||
|
| 3 |
| 3 |
| 3 |
| 3 |
(3)x(x+8)=16
x2+8x=16,
x2+8x+16=16+16,
(x+4)2=32,
x+4=±4
| 2 |
x1=-4+4
| 2 |
| 2 |
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