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【第135期】 小学数学1-6年级思维训练 每日一题

  • 2026-11-11 16:02:29
【第135期】 小学数学1-6年级思维训练 每日一题
一年级

找规律填数

1,3,5,7,9,(    )  

2,4,6,8,10,(    )  

二年级

5只猫吃5只老鼠用5分钟,20只猫吃20只老鼠用多少分钟?

三年级
 冬冬到文化用品商店买铅笔和本子,全部的钱可以买 6 支铅笔和 11 本本子,或者 8 支铅笔和 7 本本子,如果全部买本子,可以买(  )本。
四年级
  小明和他的父亲、母亲、妹妹今年四口人年龄的总和是73岁,他父亲比他母亲大3岁,小明比他妹妹大2岁。四年前小明家全体成员的年龄总和是58岁。那么今年全家四口人各几岁?
五年级
有3元,5元和7元的电影票400张,一共价值1920元,其中7元和5元的张数相等,三种价格的电影票各多少张?
六年级

  四点和五点之间,时针和分针在什么时候成直角?

一年级答案
1,3,5,7,9,(  11  )  
2,4,6,8,10,( 12   )  
二年级答案

 还是5分钟,因为还是1只猫吃一只老鼠

三年级答案

6 支铅笔+11 本本子所用的钱=8 支铅笔+7 本本子所用的钱,

等式两边都减去 6 支铅笔和 7 本本子,

得 4 本本子所用的钱=2 支铅笔用的钱数,

即 1 支铅笔的钱数=2 本本子的钱数,

冬冬的钱如果全都买本子,

可以买 2×6+11=23(本)

四年级答案

答案与解析:

题中告诉我们,四年前小明家全体成员的年龄总和是58岁。

那么今年小明家全体成员的年龄总和应该是:

58+4×4=74(岁)

      可是题中告诉们,小明和他的父亲、母亲、妹妹四口人今年的年龄总和是73岁,比74岁少1岁,说明4年前小明妹妹还没有出生,那时小明只有2-l=1岁。

四年后小明的年龄是1+4=5岁。

他妹妹的年龄是5-2=3岁。

四年后小明的父亲、母亲年龄之和是:

73-5-3=65(岁)

      又知道小明的父亲比他的母亲大3岁,因此,小明的父亲今年是:(65+3)÷2=34(岁)

      小明的母亲今年是:(65-3)÷2=31(岁)

或 34-3=31(岁)

      答:今年小明的父亲34岁,他母亲31岁,小明5岁,他妹妹3岁。

五年级答案

 解:设有7元和5元各x张,3元的(400-2x)张7x+5x+3(400-2x)=192012x+1200-6x=19206x=720x=120400-2x=160答:有3元的160张,7元、5元各120张。

六年级答案
解:钟面上有60格,它的1/4是15格,因而两针成直角的时候相差15格(包括分针在时针的前或后15格两种情况)。
  四点整的时候,分针在时针后(5×4) 格,如果分针在时针后与它成直角,那么分针就要比时针多走 (5×4-15)格,如果分针在时针前与它成直角,那么分针就要比时针多走(5×4+15)格。
  再根据1分钟分针比时针多走(1-1/12)格就可以求出 二针成直角的时间。
  (5×4-15)÷(1-1/12)≈ 6(分)
  (5×4+15)÷(1-1/12)≈ 38(分)
  答:4点06分及4点38分时两针成直角

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