题目内容
计算:(1)|
-2|+20110-(-
)-1+tan60°
(2)先化简,再求值:(a-
)(a+
)-a(a-6),其中a=
+
.
| 3 |
| 1 |
| 3 |
(2)先化简,再求值:(a-
| 3 |
| 3 |
| 5 |
| 1 |
| 2 |
(1)|
-2|+20110-(-
)-1+tan60°,
=2-
+1-(-3)+
,
=6;
(2)原式=a2-3-(a2-6a),
=a2-3-a2+6a,
=6a-3,
当a=
+
时,原式=6(
+
)-3=6
.
| 3 |
| 1 |
| 3 |
=2-
| 3 |
| 3 |
=6;
(2)原式=a2-3-(a2-6a),
=a2-3-a2+6a,
=6a-3,
当a=
| 5 |
| 1 |
| 2 |
| 5 |
| 1 |
| 2 |
| 5 |
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