(一)`探索分数的乘法公式（(I) ` exploring the multiplication formula of fractions）.docVIP

下载本文档

4
0
约6.18千字
约 8页
2017-08-22 发布于河南
举报
版权申诉

(一)`探索分数的乘法公式（(I) ` exploring the multiplication formula of fractions）.doc

1、有哪些信誉好的足球投注网站（book118）网站文档一经付费（服务费），不意味着购买了该文档的版权，仅供个人/单位学习、研究之用，不得用于商业用途，未经授权，严禁复制、发行、汇编、翻译或者网络传播等，侵权必究。。
2、本站所有内容均由合作方或网友上传，本站不对文档的完整性、权威性及其观点立场正确性做任何保证或承诺！文档内容仅供研究参考，付费前请自行鉴别。如您付费，意味着您自己接受本站规则且自行承担风险，本站不退款、不进行额外附加服务；查看《如何避免下载的几个坑》。如果您已付费下载过本站文档，您可以点击这里二次下载。
3、如文档侵犯商业秘密、侵犯著作权、侵犯人身权等，请点击“版权申诉”（推荐），也可以打举报电话：400-050-0827(电话支持时间：9:00-18:30)。
4、该文档为VIP文档，如果想要下载，成为VIP会员后，下载免费。
5、成为VIP后，下载本文档将扣除1次下载权益。下载后，不支持退款、换文档。如有疑问请联系我们。
6、成为VIP后，您将拥有八大权益，权益包括：VIP文档下载权益、阅读免打扰、文档格式转换、高级专利检索、专属身份标志、高级客服、多端互通、版权登记。
7、VIP文档为合作方或网友上传，每下载1次，网站将根据用户上传文档的质量评分、类型等，对文档贡献者给予高额补贴、流量扶持。如果你也想贡献VIP文档。上传文档

(一)`探索分数的乘法公式（(I) ` exploring the multiplication formula of fractions）

(一)`探索分数的乘法公式（(I) ` exploring the multiplication formula of fractions） Multiplication of 2.5 fractions (formerly) I. teaching objectives: 1, through exploration, to explore the law of fractional multiplication, and can be expressed in letters. 2, understand the significance of fractional multiplication. 3, master the law of fractional multiplication, and use the provisions of the calculation of fractional multiplication. 4, through the exploration study, raises the student to ponder the question ability. Two, teaching key points and difficulties: Key points: multiplication of fractions Difficulty: multiplication of fractions Three, teaching process (1) to explore the multiplication formula of fractions Review the significance of fractions. Thinking: what is the meaning of the multiplication of two fractions, for example? (how) should it be calculated? Figure, a square of length 1, while 5 divisions, 4 samples of them, painted blue, blue is a part of the original square. as a whole, and then on the other side of the square is divided into 3 parts, 2 samples of the painted purple purple part. That is the meaning. As you can see from the diagram, the purple part takes up the square, that is, the purple part = In general, the score is the meaning of a whole is divided into Q parts and the P, so we put the two fraction multiplication significance is defined as: scores on the basis of the overall thought, and then is divided into N parts and the m, the result is that (= q = 0, n = 0) The multiplication of two points, the product of multiplying molecules as numerator, and the product of multiplication of the denominator as the denominator Example 1, calculation: (1); (2); (3) Exercise: 1, 2, 3, Note: first take fractions to the false score; fraction multiplication preengage then quadrature. Example 2, calculation: (1); (2) (practice) Therefore, we can observe by examples: An integer is multiplied by a fraction, and the numerator of an integer and a fraction is the numerat