小学四年级学生对平均数概念理解的发展过程   总被引：1，自引：0，他引：1  

吴骏 《数学教育学报》2011,(3):39-41,102

利用Pirie和Kieren提出的数学理解发展模型,分析了3名小学四年级学生对平均数概念理解的发展过程.结果表明:学生对平均数概念的理解经历了初步了解、产生表象、形成表象、关注性质和形式化等5个水平.在理解发展过程中,当学生发现他的思想和行动与自己所面临的问题不一致时,他就要折返回内层水平来扩展自己目前的活动能力和活动空间.而教师的干预则激发了学生的折返,为学生提供了独立建构或修正个人表象的机会.  相似文献   

Increasing engagement of students with learning disabilities in mathematical problem‐solving and discussion     

Rachel Lambert  Trisha Sugita 《Support for Learning》2016,31(4):347-366

Engagement in problem‐solving and mathematical discussion is critical for learning mathematics. This research review describes a gap in the literature surrounding engagement of students with Learning Disabilities in standards‐based mathematical classrooms. Taking a sociocultural view of engagement as participation in mathematical practices, this review found that students with LD were supported towards equal engagement in standards‐based mathematics through multi‐modal curriculum, consistent routines for problem‐solving, and teachers trained in Mathematical Knowledge for Teaching. Using this small set of studies (7), we identify the need to deepen the engagement of students with LD in mathematical problem‐solving and discussion. This review concludes with implications for teaching and learning.  相似文献   

Key somatic variables associated with,and differences between the 4 swimming strokes     

Alan M. Nevill  Yassine Negra  Tony D. Myers  Senda Sammoud  Helmi Chaabene 《Journal of sports sciences》2020,38(7):787-794

ABSTRACT

This study identified key somatic and demographic characteristics that benefit all swimmers and, at the same time, identified further characteristics that benefit only specific swimming strokes. Three hundred sixty-three competitive-level swimmers (male [n = 202]; female [n = 161]) participated in the study. We adopted a multiplicative, allometric regression model to identify the key characteristics associated with 100 m swimming speeds (controlling for age). The model was refined using backward elimination. Characteristics that benefited some but not all strokes were identified by introducing stroke-by-predictor variable interactions. The regression analysis revealed 7 “common” characteristics that benefited all swimmers suggesting that all swimmers benefit from having less body fat, broad shoulders and hips, a greater arm span (but shorter lower arms) and greater forearm girths with smaller relaxed arm girths. The 4 stroke-specific characteristics reveal that backstroke swimmers benefit from longer backs, a finding that can be likened to boats with longer hulls also travel faster through the water. Other stroke-by-predictor variable interactions (taken together) identified that butterfly swimmers are characterized by greater muscularity in the lower legs. These results highlight the importance of considering somatic and demographic characteristics of young swimmers for talent identification purposes (i.e., to ensure that swimmers realize their most appropriate strokes).  相似文献   

2CUL Slavic: The View So Far     

Robert Davis 《Slavic & East European Information Resources》2017,18(1-2):67-73

In fall 2016, the Columbia-Cornell collaboration in the area of Slavic & East European resource coordination and sharing celebrated its sixth year. The author reviews particulars of the development, implementation, and function of this program as well as some of the challenges that face such cross-institutional efforts.  相似文献   

一类离散型随机变量     

刘青桂  王书田  郝香芝 《石家庄职业技术学院学报》2005,17(6):47-48

介绍了一类有趣的离散型随机变量。它的均值和方差都是1，并由此得到了几个求和公式．而这几个公式的求和问题不论是用初等方法或分析方法都是比较困难的，但用概率的方法却比较容易解决．  相似文献   

正确培养大学生的数学思维品质     

吴亚敏  阙庆喜  何绍勇 《武汉职业技术学院学报》2005,4(6):78-81

以发展个性思维为目的，探讨了培养学生思维的精度、速度、新度、深度、广度等五个方面的思维品质。  相似文献   

芝诺悖论的又一现代翻版--调和级数悖论     

欧阳耿 《喀什师范学院学报》2003,24(6):17-20

通过发现芝诺悖论的又一个翻版——调和级数悖论，再一次证明，在传统的有穷-无穷理论体系中，人们永远不可能解决芝诺通过悖论要求人们解决的问题，并且永远无法制止新的芝诺悖论翻版的产生。  相似文献   

对数学课堂教学中创新思维培养的探讨   总被引：1，自引：0，他引：1  

郑神州 《教育与现代化》2004,(4):25-29

针对当前教学评价中存在的一些问题，笔提出了在大学的数学教学中实施数学素质教育和创新能力培养相结合的实践途径，即教师科学地将专业研究成果、教材教学经验和实际应用案例等多方面知识贯穿于教学途径。  相似文献   

多媒体环境下大学英语教学模式探究   总被引：2，自引：0，他引：2  

刘晓平 《海南师范大学学报(社会科学版)》2006,19(3):151-153

文章通过对现有大学英语教学模式的思考,结合外语教学特点,从多媒体视角探究了多元化英语教学模式(即立体信息输入式、自我驱动模式、电子交互模式、文化意识培养模式),以期为大学英语教学实践提供新的思路和视角。  相似文献   

马克思价值转形问题上中国人数学解法的无效创意     

陈勇勤 《南阳师范学院学报》2007,6(11):32-43

转形问题长期陷入数学求证困境,所得到的各种结果与中外研究者所投入的时间和精力不能成正比。本文列举的中国人的三种解法,各有其特点。既要识别真伪性,也要识别合理性与不合理性。三种解法都以"西方构思"为本源,做出一点点创新(新的未必就不是伪的或不合理的),但都没有突破"西方构思"的基本框架。西方学者刻意追求数学证明,往往又止步在证伪"两个等于"。数学求证有一定的局限性。突破其局限性,不是数学技巧问题,而是数学思维问题。但是,改变数学思维终归替代不了从数学求证转换到非数学求证。  相似文献