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小学1-6年级数学思维训练每日一题【第1492天】~2026.11.07

  • 2026-11-07 15:16:55
小学1-6年级数学思维训练每日一题【第1492天】~2026.11.07

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一年级

     数一数,图中有多少个正方形?

二年级

       7棵树栽成3行,每行3棵,怎么栽?

三年级

       甲乙二人相距30米面对面站好,两人玩石头剪刀布,胜者向前走8米,负者向后退5米,平局两人各向前走1米,玩了10局后,两人相距7米,那么两人平了多少局?

四年级

          一本书从第1页开始编排页码,共用数字2355个(重复的数字重复计算,例如33是两个数字),那么这本书共有多少页?

五年级

      甲、乙、丙三人拿出同样多的钱共同买一批苹果。分配时,甲和乙都比丙多拿了36千克。结账时,甲和乙都付给丙36元。每千克苹果多少元?

六年级

       如图长方形被分成两部分,已知阴影面积比空白部分面积大34平方厘米,求阴影部分的面积。

      请做完题之前不要看下面的答案!!独立思考很重要!切记!切记!切记!

答

案

解

析

一年级

【答案】20个。

【解析】可以这样想:先数单个的小正方形:每行有4个,3行一共12个;

     4个小正方形可以组成较大的正方形,如下图1。将红色的方框往右移动,再往下移动,会发现这样的正方形有6个;

       9个小正方形可以组成更大的正方形,如下图2。将黄色的方框往右移动,会发现图中这样的正方形有2个;

      接着尝试,无法找到更大的正方形。最后将数出正方形的个数加起来:12+6+2=20个,所以图中一共有20个正方形。

二年级

【答案】

【解析】一般情况下,栽成3行,每行3棵,能栽树3×3=9(棵),但题目中是7棵树栽成3行,所以少了9-7=2(棵)。因此栽树时要两行合用1棵,或者三行合用1棵。

       两行合用1棵的情况如下图: 

   三行合用1棵的情况如下图:

三年级

【答案】两人平了7局。

【解析】根据题意“胜者向前走8米,负者向后退5米”可知,胜一局两人的距离就减少了8-5=3(米);根据题意“平局两人各向前走1米”可知,平一局两人的距离就减少了1+1=2(米);玩了10局后,两人相距7米,说明两人的距离一共减少了30-7=23(米)。

      假设这10局都是平局,两人的距离会减少2×10=20(米),比实际的23米少了23-20=3(米),每胜一局比每平一局多减少3-2=1(米),所以,可以求出胜的局数:3÷1=3(局),那么平局就是10-3=7(局)。

四年级

【答案】这本书共有821页。

【解析】根据题意,把页码所用的数字按位数分类,①一位数:1~9共用数字1×9=9(个);②二位数:10~99共用数字2×90=180(个);③三位数:100~999共用数字3×900=2700(个)。

       因为题目说页码中共用的数字有2355个,2355<2700,所以所求页数不超过999页。又因为页码中的一位数用了9个数字,页码中的两位数用了180个数字,所以页码中三位数用的数字总个数为:2355-9-180=2166(个);那么页码中三位数的个数为:2166÷3=722(个),即:从100页到821页,所以本书共有821页,也可以用:99+722=821(页)。

五年级

【答案】每千克苹果3元。

【解析】因为“甲、乙、丙三人拿出同样多的钱共同买一批苹果”,所以按道理3人应分得同样多的苹果,但实际分配时,甲和乙都比丙多拿了36千克,很明显,丙少拿了,那丙少拿了多少千克呢?其实,按道理,甲、乙多拿的苹果总质量应该三个人平均分,每人应分得36×2÷3=24(千克),但实际都被甲和乙拿走了,所以丙少拿了24千克苹果。根据题意“结账时,甲和乙都付给丙36元”可知:甲和乙一共付给丙36×2=72(元),这72元就是丙少拿的24千克苹果的钱数,所以每千克苹果的价钱是72÷24=3(元)。

六年级

【答案】107平方厘米。

【解析】

  方法一:首先根据条件可求得长方形面积为:18x10=180(平方厘米)

      一方面,观察图形可知:

     长方形的面积=阴影部分面积+空白部分面积=180平方厘米

      另一方面,根据条件可知:

      阴影部分的面积-空白部分面积=34平方厘米

  所以,就可以根据”和差问题”的规律求出阴影部分的面积为:

(180+34)÷2=107(平方厘米)。

    方法二:

      我们还可以从另一种角度来思考,考虑条件”阴影部分面积比空白部分面积大34平方厘米”中多出的部分。

      为了把34平方厘米的这个条件在图中明确地刻画出来,我们按下图的方式进行分割:

       显然,右图中的阴影长方形的面积就等于平方厘米。这样,就把题目中的文字条件与它在图形中的对应关系搞清楚了。由此不难求出,阴影长方形的宽为:34÷10=3.4(厘米),那么三角形的底为:18-3.4=14.6(厘米),所以它的面积为:14.6x10÷2=73(平方厘米),则阴影部分的面积为:34+73=107(平方厘米)

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  137. /www/wwwroot/www.sjds.net/vendor/topthink/think-template/src/template/driver/File.php ( 2.41 KB )
  138. /www/wwwroot/www.sjds.net/vendor/topthink/think-template/src/template/contract/DriverInterface.php ( 0.86 KB )
  139. /www/wwwroot/www.sjds.net/runtime/temp/022a5b1eae5a9e3c31e54f699d8ae600.php ( 8.36 KB )
  140. /www/wwwroot/www.sjds.net/vendor/topthink/think-trace/src/Html.php ( 4.42 KB )
  1. CONNECT:[ UseTime:0.000809s ] mysql:host=172.18.0.4;port=3306;dbname=www_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000981s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000388s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000353s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000546s ]
  6. SELECT * FROM `set` [ RunTime:0.000245s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000665s ]
  8. SELECT * FROM `article` WHERE `id` = 540110 LIMIT 1 [ RunTime:0.000404s ]
  9. UPDATE `article` SET `lasttime` = 1794078811 WHERE `id` = 540110 [ RunTime:0.001592s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000287s ]
  11. SELECT * FROM `article` WHERE `id` < 540110 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000432s ]
  12. SELECT * FROM `article` WHERE `id` > 540110 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000337s ]
  13. SELECT * FROM `article` WHERE `id` < 540110 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000465s ]
  14. SELECT * FROM `article` WHERE `id` < 540110 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000656s ]
  15. SELECT * FROM `article` WHERE `id` < 540110 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000498s ]
0.085516s