题目内容
(1)用“<”,“>”,“=”填空:
(2)由上可知:
①|1-
|=
-1
-1
②|
-
|=
-
-
③|
-
|=
-
-
④|
-
|=
-
-
(3)计算(结果保留根号):
|1-
|+|
-
|+|
-
|+|
-
|+…+|
-
|
| 1 |
<
<
| 2 |
<
<
| 3 |
<
<
| 4 |
<
<
| 5 |
(2)由上可知:
①|1-
| 2 |
| 2 |
| 2 |
②|
| 2 |
| 3 |
| 3 |
| 2 |
| 3 |
| 2 |
③|
| 3 |
| 4 |
| 4 |
| 3 |
| 4 |
| 3 |
④|
| 4 |
| 5 |
| 5 |
| 4 |
| 5 |
| 4 |
(3)计算(结果保留根号):
|1-
| 2 |
| 2 |
| 3 |
| 3 |
| 4 |
| 4 |
| 5 |
| 2009 |
| 2010 |
分析:(1)根据对于大于1的数,数越大其算术平方根越大,则有
<
<
<
<
;
(2)根据(1)的结论和绝对值的意义进行化简;
(3)利用(2)的结论得到原式=
-1+
-
+
-
+
-
+…+
-
,然后合并即可.
| 1 |
| 2 |
| 3 |
| 4 |
| 5 |
(2)根据(1)的结论和绝对值的意义进行化简;
(3)利用(2)的结论得到原式=
| 2 |
| 3 |
| 2 |
| 4 |
| 3 |
| 5 |
| 4 |
| 2010 |
| 2009 |
解答:解:(1)<,<,<,<;
(2)①
-1;②
-
;③
-
;④
-
;
(3)原式=
-1+
-
+
-
+
-
+…+
-
=
-1.
(2)①
| 2 |
| 3 |
| 2 |
| 4 |
| 3 |
| 5 |
| 4 |
(3)原式=
| 2 |
| 3 |
| 2 |
| 4 |
| 3 |
| 5 |
| 4 |
| 2010 |
| 2009 |
=
| 2010 |
点评:本题考查了实数的运算:先算乘方,再算乘除,然后进行加减运算;有括号先算括号.也考查了实数的大小比较.
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