题目内容
计算:(1)(π-2009)0+
| 12 |
| 3 |
(2)(4
| 6 |
|
| 8 |
| 2 |
(3)|-2|+(
| 1 |
| 3 |
| 2 |
| 9 |
(4)
| ||
| 2 |
| 12 |
|
| 48 |
(5)-22+(
| 3 |
| 3 |
| 1 |
| 2 |
| 3 |
(6)
| 3 | 8 |
| 2 |
| 8 |
| 2 |
分析:先观察每题的特点,可以首先把括号内的化简,合并同类项,然后相乘,也可以运用分配律进行简便计算.
解答:解:(1)(π-2009)0+
+|
-2|=1+2
+2-
=3+
;
(2)(4
-4
+3
)÷2
=4
×
-2
×
+6
×
=2
-1+3=2
+2;
(3)|-2|+(
)-1×(π-
)0-
+(-1)2=2+3×1-3+1=3;
(4)
(2
+4
-3
)=
(4
+
-12
)=1-4
;
(5)-22+(
-1)×
+(-
)-2+(-π)0-|2-
|=-4+3-
+4+1-(2-
)=2;
(6)
-(π-2)0-|1-
|+
+(-1)2009-|-
|=2-1+1-
+2
-1-
=1.
| 12 |
| 3 |
| 3 |
| 3 |
| 3 |
(2)(4
| 6 |
|
| 8 |
| 2 |
| 6 |
| 1 | ||
2
|
| 2 |
| 1 | ||
2
|
| 2 |
| 1 | ||
2
|
| 3 |
| 3 |
(3)|-2|+(
| 1 |
| 3 |
| 2 |
| 9 |
(4)
| ||
| 2 |
| 12 |
|
| 48 |
| ||
| 2 |
| 3 |
| 2 |
| 3 |
| 6 |
(5)-22+(
| 3 |
| 3 |
| 1 |
| 2 |
| 3 |
| 3 |
| 3 |
(6)
| 3 | 8 |
| 2 |
| 8 |
| 2 |
| 2 |
| 2 |
| 2 |
点评:熟练化简二次根式后,在加减的过程中,有同类二次根式的要合并;相乘的时候,被开方数简单的直接让被开方数相乘,再化简;较大的也可先化简,再相乘,灵活对待.
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