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争议和商榷:小学人教版数学教材六年级上册第62页一道例题

  • 2026-04-06 02:53:29
争议和商榷:小学人教版数学教材六年级上册第62页一道例题

说明:

存在争议是:

六年级不满12周岁的学生能不能骑自行车上路?半径为33cm车轮的车到底是什么规格的自行车?国标是用cm还是用mm

值得商榷是:

有没有必要每次都把圆周率当成3.14来计算,中西方数学教材有区别吗?

正文:

一、小明能不能骑自行车上学?

按照《中华人民共和国道路交通安全法实施条例》第七十二条明确规定:12周岁前的儿童禁驾驶自行车在公路、城市道路、小区道路、人行道等公共道路骑行。六年级上学期的学生年龄大多是11-12周岁,如果“小明”已满12周岁,是可以骑行上学的。

需要告诫学生,尽管是一个班,如果不满12周岁是不能骑行上学的,是一种违法行为。

二、例题中“小明的自行车的半径是33cm”,到底是什么规格的自行车?规格用mm还是应该用cm

按照自行车国家质量标准,最常见的有车轮半径为338mm351mm两类,也就是人们口语中所说的“二六车”和“二八车”的规格标准。汽车和电动自行车不普及之前,人们口语中所说的“二六车”和“二八大扛”,就是上边两个车的车轮的“国标”,那是一代人的记忆。

为什么338mm351mm会称为“二六车”和“二八车”呢?这有一个国际标准认证问题,国际标准使用英寸作为半径单位,338mm折合为26英寸,351mm折合成27.5英寸,口语就说28英寸,就是“二八大杠”的来历。

本例题应该使用338mm330mm为单位,而不是33cm,因为在国家质量标准里,不用cm作为自行车半径的标准单位。

二年级上册数学学过了cm m,三年级上册有学习了mmdmKm,应该说长度单位都已经学过了,教材例题就应该用338mm,而不是33cm,这样既不符合国家质量标准的规定,也不利于孩子们随后学习各种质量规格标准时计量单位的使用。

该题要求“结果保留整米数”,那就没有必要让孩子们进行精确计算,因为结果保留整米数,实际上是一种估算,估算符合四舍五入标准即可。

例题的这种处理,是在告诉学生,估算也要先精确计算再去四舍五入,这种做法已经在不同的考试中有所体现,这是一种误导,不符合估算的本质要求。

该题的做法至少有两种:

第一种就是课本上的例子,但是课本上的例子偏离了估算的本质,只需算2×3×30=180cm=2m)而不是如教材上的那么麻烦和误导。

第二种是先换算单位,33cm=0.33m。计算2×3×0.33=1.98m=2m

这样做才符合题目关于保留“整米数”的要求,最符合题目要求的本质。

小学数学在学习圆周率π时,都是小学生计算的噩梦,在学习圆周长、面积,圆柱和圆锥体积的日子里,每天学生都要计算大量的π与其它数的乘积,真是苦不堪言。

有人说这是传统,鲁迅先生在《狂人日记》里有一句话:“一直如此,便对么?”

有没有必要每次都把圆周率π算成具体的数,也就是每次都默认圆周率π=3.14进行烦琐计算?

三、到底有没有必要把π转化为3.14反复进行计算?

鲁迅先生在那个年代提出了一个尖锐、深刻而犀利的问题,人们在实践中应有挑战传统和习惯权威的勇气,它不仅是对传统和习惯的质疑,更是对个人独立思考能力和创新精神的呼唤。它还提醒我们,在面对任何问题和挑战时,都应该保持开放的心态,勇于质疑和探索,从而找到更加合理和有效的解决方案。

中国小学数学长期以来,在计算圆周、圆面积、圆柱和圆锥体积时,总是默认圆周率π=3.14的习惯,而且在计算的过程中,也“约定”其周长、面积、体积的结果都是“=”,而不是约等号,这种把近似值变成精确值的“约定”就对吗?如此烦琐的计算,到底有什么意义?

尽管这次课程改革者已经大幅度向西方哲学甚至西方思维靠拢,但是在计算π计算的问题上,一直没有松动,沿用许多年不变的传统。

许多一线教师为了提高学生的运算正确性,不得不让学生背诵圆周率π的倍数作为工具,这显然是增加了学生的学习负担。

但如果不背,遇到题目,每次都列竖式计算,也确实更为麻烦,这怎么办呢?

学过更高级数学的人们都知道,一旦进入到数学的另一个阶段,就是到初中,π作为一个常数,常常不参与直接数据运算,就写π,如2π、3π/2等,到高中甚至大学,π作为常数,就再难见到要计算近似值的时候了。

从数学学习的发展来看,小学生有没有必要一直求π近似值?而且以后很少用到,真的有必要吗?

看一看西方数学教材对圆周率π的处理:

西方教材在接触到写公式、写精确答案时,必须用π,毕竟π才是精确值。圆面积写成S=πr2答案写成4π、25π这种,是标准、满分的写法。只有题目明确要求求近似值,这时才根据题目要求是用3.14 还是3.1416进行计算。

比如西方教材的一类比较少见的数学题(小编附带翻译一下):Use π≈3.14(用圆周率的近似值3.14),Give your answer to 2 decimal places(答案保留两位小数),这时学生才去计算π的近似值。

西方数学家或老师普遍认为,从小学到初高中、大学都一样,他们非常习惯保留π,不喜欢也不习惯一上来就乘 3.14,这是确保数学精确性的做法。

西方的习惯是:能用π就用π,只有严格要求求近似值时,还给出近似值小数点后几位的规定,这个时候才用于计算π的近似值。

结论:

这次课程改革,专家们那么相信西方数学,为什么在这一点上不学学西方,用于减轻学生的学习负担呢?

欢迎广大关注教育的人们留言评论讨论。

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  1. CONNECT:[ UseTime:0.000633s ] mysql:host=127.0.0.1;port=3306;dbname=c_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000708s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.002489s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000317s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000538s ]
  6. SELECT * FROM `set` [ RunTime:0.000266s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000669s ]
  8. SELECT * FROM `article` WHERE `id` = 463931 LIMIT 1 [ RunTime:0.014721s ]
  9. UPDATE `article` SET `lasttime` = 1775578464 WHERE `id` = 463931 [ RunTime:0.000541s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000328s ]
  11. SELECT * FROM `article` WHERE `id` < 463931 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.002250s ]
  12. SELECT * FROM `article` WHERE `id` > 463931 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002260s ]
  13. SELECT * FROM `article` WHERE `id` < 463931 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000639s ]
  14. SELECT * FROM `article` WHERE `id` < 463931 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.115930s ]
  15. SELECT * FROM `article` WHERE `id` < 463931 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.084254s ]
0.293725s