在代数中，我们在称为替换的过程中用数字替换字母。给定公式 A = 1/2bh，如果底部为 5 厘米，高度为 10 厘米，则面积为 ½ X 5 X 10，因为我们已经将 b 替换为 5，将 h 替换为 10。你只需要小心负数：在计算负数时最好使用方括号。 请访问我们的网站 www.fuseschool.org，我们所有的视频都按照主题和顺序经过精心整理过。请评论、点赞和与其他学员分享。你可以提问和回答问题，老师会回复你。 这些视频可以在翻转课堂模式中使用，也可以用作修订辅助工具。 本开放教育资源是免费的，根据知识共享许可：署名-非商业性使用 CC BY-NC（查看许可证契约：http://creativecommons.org/licenses/by-nc/4.0/）。您可以下载该视频用于非营利性教育用途。如果你想修改视频，请联系我们：info@fuseschool.org 点击这里观看更多视频：https://alugha.com/FuseSchool 推特：https://twitter.com/fuseSchool 在 FuseSchool 平台和应用程序中获得更深入的学习体验：www.fuseschool.org
Learn the basics about what an atom is? How do you recognize an atom, what are its properties? Find out more in this video! What Is An Atom - Part 2 - Isotopes -> https://bit.ly/3wFaokF This Open Educational Resource is free of charge, under a Creative Commons License: Attribution-NonCommercial C
Click here to see more videos: https://alugha.com/FuseSchool In this video we’re going to look at how to simplify algebraic expressions. Before we get started on simplifying, a few things to remember: (1) we always use a use a curly x for the letter x in algebra. (2) We don’t really use the mul
Watch this video to discover how to plot straight lines onto a graph. VISIT us at www.fuseschool.org, where all of our videos are carefully organised into topics and specific orders, and to see what else we have on offer. Comment, like and share with other learners. You can both ask and answer que
