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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2df39bcfac80e819bd7d987e5bd64cc2.png)
更新时间:2016-12-06 04:53:17
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解答题-计算题
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【推荐2】已知:
,
(a、b为常数),小红在计算时不小心将
写成
,计算得到最终结果为
,你能帮助小红算出正确结果吗?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f8c7721d39331207751e80f9d0839e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72e8c98b25bd52b17da5d0dbc3aea859.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ce69cd33d105ce280170f0cd0513026.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e9e460c144f7a2141d2df0308b125f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d9bd357d1c21b0e6b6c8f276b93c7ce.png)
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解答题-问答题
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【推荐3】探究规律,完成相关题目.
将若干个数组成一个正方形数阵,若任意一行,一列及对角线上的数字之和都相等,则称具有这种性质的数字方阵为“幻方”.中国古代称“幻方”为“河图”“洛书”等.如图所示的三阶幻方,是将数字1,2,3,4,5,6,7,8,9填入到
的方格中得到的,其每一行,每一列,每一条对角线上的三个数字之和都相等.
![](https://img.xkw.com/dksih/QBM/2020/12/10/2618060314730496/2634277735145472/STEM/cea50b298a7a4669a0bfd39f6532a274.png?resizew=129)
(1)设下面的三阶幻方中间的数字是
(其中
为正整数),请用含
的代数式将下面的幻方填充完整;
(2)若设(1)幻方中9个数的和为
,则
与中间的数字
之间的数量关系为______;
(3)现要用9个数:-40,-30,-20,-10,0,10,20,30,40构造一个三阶幻方,请将构造的幻方填写在下面
的方格中.
将若干个数组成一个正方形数阵,若任意一行,一列及对角线上的数字之和都相等,则称具有这种性质的数字方阵为“幻方”.中国古代称“幻方”为“河图”“洛书”等.如图所示的三阶幻方,是将数字1,2,3,4,5,6,7,8,9填入到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/777d8fccf0cf8b55a68488fe48b78744.png)
![](https://img.xkw.com/dksih/QBM/2020/12/10/2618060314730496/2634277735145472/STEM/cea50b298a7a4669a0bfd39f6532a274.png?resizew=129)
(1)设下面的三阶幻方中间的数字是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
______ | ![]() | ![]() |
______ | ![]() | ![]() |
______ | ______ | ![]() |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(3)现要用9个数:-40,-30,-20,-10,0,10,20,30,40构造一个三阶幻方,请将构造的幻方填写在下面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/777d8fccf0cf8b55a68488fe48b78744.png)
![](https://img.xkw.com/dksih/QBM/2020/12/10/2618060314730496/2634277735145472/STEM/738aa68b5d9f4a968c9f5a0aa0bbeedb.png?resizew=126)
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