Which number should be filled in the blank?5 7 39 23 4空白处就是“?”

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Which number should be filled in the blank?5 7 39 23 4空白处就是“?”
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Which number should be filled in the blank?5 7 39 23 4空白处就是“?”
Which number should be filled in the blank?
5 7 3
9 23 4
空白处就是“?”

Which number should be filled in the blank?5 7 39 23 4空白处就是“?”
10
左右项之积减去左右项之和等于中间项

5*3-(5+3)=15-8=7
9*4-(9+4)=36-13=23
所以
2x-(2+x)=8
解得x=10
如果没记错的话,这是2001年全国中学生英语能力竞赛(NEPCS)决赛题,我当年有幸参加过哦(^o^)
回答者:mrss0404 - 魔法师 五级 9-6 02:18
我刚刚问好这个题呵```没想到你也在问呢```
这是我那一个姐姐答的```我连名字一起复制过来了呵```不算抄袭吧```

哇,二楼的好厉害呦

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