在有理数运算时,我们发现了:
,
,
……据上述理论,请你计算
(1)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41599b64a08f053efeefa9b69bcedb2a.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d842b2e150d723c948234ee36f4b6b0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b61dfa259a7cfab28fe63ff7d6211b1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7f4890678dc22224b4d23a8c38fbf11.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41599b64a08f053efeefa9b69bcedb2a.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8990f963a7f4d29c7244ef0f029415fe.png)
更新时间:2020-10-28 10:28:59
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相似题推荐
解答题-计算题
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适中
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【推荐1】阅读材料:小兰在学习数轴时发现:若点
表示的数分别为
,3,则线段
的长度可以这样计算:
或
,那么当点
表示的数分别为m,n时,线段
的长度可以表示为
或
.
请你参考小兰的发现,解决下面的问题.
在数轴上,点A,B,C分别表示数a,b,c.给出如下定义:若
,则称点B为点A,C的双倍绝对点.
(1)如图1,
.
①若
,点
在数轴上分别表示数
,5,7,在这三个点中,点 是点
的双倍绝对点;
②若B是
的双倍绝对点,且
,则
;
(2)若
,B为点
的双倍绝对点,则
的值为 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6c2c469e50b231ff7667fbc96c19ccc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa29fe6cd9eb51c184f6299d437375cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a653fd36a5a4c12d9ff195d2fb6cc5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ae1a0e6e2475da6ec31cb51031913fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6c2c469e50b231ff7667fbc96c19ccc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa29fe6cd9eb51c184f6299d437375cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae9dd56551121a5b88be4dc6910c9ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e99c4d1ecc1784de3a8050bac0f1d89c.png)
请你参考小兰的发现,解决下面的问题.
在数轴上,点A,B,C分别表示数a,b,c.给出如下定义:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/138eb2ca07fd304269a945f25b3e8afb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/30/19ecdf95-c096-449b-a3f3-ae0f4adbe57e.png?resizew=534)
(1)如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b108ab31cc093f03cf48ad65429889e.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6de1d395e6c48c0676a1488a299479d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411f17e4cec08776596dc208a228f920.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81fb134b2b48acc99213fff6ccfee65f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/434ed6ba5baf9fe90326f63449f1c27d.png)
②若B是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/434ed6ba5baf9fe90326f63449f1c27d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aadb3885f4f2a3c2bf493a6380304de7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ccd4162c7d09f970cb77cadacdbe521.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d56b3c8a7a7897821ad77212452e60d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b00c9499415c5801c64a8177f4b35e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
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解答题-计算题
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适中
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【推荐1】观察下列等式
=1-
,
=
-
,
=
-
,
将以上三个等式两边分别相加得:
+
+
=1-
+
-
+
-
=1-
=![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b2a698891d42c70b597f0da4f215f09.png)
(1)猜想并写出:
= .
(2)直接写出下列各式得计算结果:
①
+
+
+…………+
= .
②
+
+
+…………+
= .
(3)探究并计算:
①
+
+
+…………+
.
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5ed98e34b84285163a8b1b45c6fe403.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/231fd0fbb933002c6a527dcc4f7186f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac4a646b098601ebe77beadf1707deca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d266a04f3dc7483eddbc26c5e487db.png)
将以上三个等式两边分别相加得:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5ed98e34b84285163a8b1b45c6fe403.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/231fd0fbb933002c6a527dcc4f7186f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac4a646b098601ebe77beadf1707deca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d266a04f3dc7483eddbc26c5e487db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d266a04f3dc7483eddbc26c5e487db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b2a698891d42c70b597f0da4f215f09.png)
(1)猜想并写出:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7928cc7a6ebf95b2928289d3350960f2.png)
(2)直接写出下列各式得计算结果:
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5ed98e34b84285163a8b1b45c6fe403.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/231fd0fbb933002c6a527dcc4f7186f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac4a646b098601ebe77beadf1707deca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/017e456192eb3866048bba6cc64c4dd3.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5ed98e34b84285163a8b1b45c6fe403.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/231fd0fbb933002c6a527dcc4f7186f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac4a646b098601ebe77beadf1707deca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ef9bd4b9563242eeccf0be121213a97.png)
(3)探究并计算:
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c9ed0f5980039d8a3337f1265030bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d6faac9408a6fdfd4bb9521e050fd47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbd568caaa2c3d31792cc10c6eb93464.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d5037db9fca087f693576e75ecb126a.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4569e843916c9e77c6888ba7ae782665.png)
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【推荐2】观察下列两组等式:
①
,……
②
,……
(1)根据你的观察,先写出猜想:
①
②![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b13b31e2b30c2a2affdd9128f4f50fe1.png)
(2)然后,用简单方法计算下列各题:
①
② 若有理数a、b满足
,试求:
的值
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/936a9b4a30a77570e793373587b99676.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c29af8bfee758d854e9f53533d9a5596.png)
(1)根据你的观察,先写出猜想:
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df2f6eeaf60d2aa24042ed3236344f24.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b13b31e2b30c2a2affdd9128f4f50fe1.png)
(2)然后,用简单方法计算下列各题:
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/911e83272adbdabe412a3508d1972c0b.png)
② 若有理数a、b满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e22bdb0ba3d03ba1985fd7cd52c7ea44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a86b1e71816456df25d5479a1213b125.png)
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名校
【推荐3】问题提出:
如图,将全体正整数排成一个三角形数阵,按照图中排列的规律,第n行(
)从左向右的第3个数字为m,请用含n的代数式表示m.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/14/216bd64b-36db-4711-93a1-136e3e158bd6.png?resizew=122)
问题解决:
小明同学认真观察数阵,经过思考后解决了问题,小明同学分两步解决这个问题
第1步先计算出数阵第
行的末尾数字.
第2步再计算出m.请认真分析小明的解题过程并填空.
小明的解题过程:
因为第1行有1个数字是1,第2行有2个数字是2,3,第n行有n个数字,
所以第
行应该有
个数字,因此前
行共有数字
个,
所以三角形数阵的第
行末尾数字用含n的代数式表示为______(直接填写)
因为第n行(
)从左向右的第3个数字为m,由此可得:
______.(直接填写)
如图,将全体正整数排成一个三角形数阵,按照图中排列的规律,第n行(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/029da2067b3564cee13879e402a89a01.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/14/216bd64b-36db-4711-93a1-136e3e158bd6.png?resizew=122)
问题解决:
小明同学认真观察数阵,经过思考后解决了问题,小明同学分两步解决这个问题
第1步先计算出数阵第
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c963caefd1a314ca9641ae98ee57237f.png)
第2步再计算出m.请认真分析小明的解题过程并填空.
小明的解题过程:
因为第1行有1个数字是1,第2行有2个数字是2,3,第n行有n个数字,
所以第
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c963caefd1a314ca9641ae98ee57237f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c963caefd1a314ca9641ae98ee57237f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c963caefd1a314ca9641ae98ee57237f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bde123b1159c61aca479698878b03ad2.png)
所以三角形数阵的第
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c963caefd1a314ca9641ae98ee57237f.png)
因为第n行(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/029da2067b3564cee13879e402a89a01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
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