谷歌课堂

GeoGebra 教室

Signed Subtraction

作者:Kevin Hopkins

主题:减法

Subtracting with negatives is not difficult once you learn to do it and once you see why it works the way it does. See a video at http://www.artofproblemsolving.com/Videos/external.php?video_id=22 for an explanation.

新资源

发现资源

发现主题