如图,
均为有理数,图中各行,各列及两条对角线上三个数的和都相等,则
的值为( )
![](https://img.xkw.com/dksih/QBM/2022/11/8/3105161476399104/3110908455919616/STEM/5d65889945d44f99a8fcdb9dd62f658a.png?resizew=96)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6100600d66c373a2d910c06637bfcf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dff3c4dd3758178837b5ac934708e051.png)
![](https://img.xkw.com/dksih/QBM/2022/11/8/3105161476399104/3110908455919616/STEM/5d65889945d44f99a8fcdb9dd62f658a.png?resizew=96)
A.1 | B.![]() | C.7 | D.8 |
更新时间:2022-11-16 15:42:22
|
【知识点】 数字问题(一元一次方程的应用)解读
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【推荐1】幻方是古老的数学问题,我国古代的《洛书》中记载了最早的幻方-九宫格,将9个数填入幻方的空格中,要求每一横行、每一竖行以及两条对角线上的3个数之和相等,如图是一个未完成的幻方,则图中
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
4 | 2 | |
7 | ||
m |
A.1 | B.2 | C.4 | D.67 |
您最近一年使用:0次
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较易
(0.85)
【推荐2】我们知道,无限循环小数都可以转化为分数.例如,将
转化为分数时,可设
,则
,即
,解得
,即
,那么,将
转化为分数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80be1c5a8cb03e63d135223b6a5d0a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c99176f31e1c20f4bfe96aa25733a8b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3148c0d6579d8e2848879419bf2a923c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eaa9cc9bcea3c0bc027bb8a6d7756e14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fbe58b54551b96ad8bd7f60dd321c2f.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
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