Years ago, I enjoyed reading books about how to do arithmetic mentally and quickly (there are several of them - one good one is "Math Magic" by Scott Flansburg). There did not seem to be anything equivalent for more abstract math, i.e. algebra and calculus. For some reason, I cared so much that I actually took the trouble to write a couple…
很多年前，我很喜欢读教人如何快速心算的书（这种书有好几本——其中一本很棒的是斯科特·弗兰斯伯格的《Math Magic》）。但对于更抽象的数学，比如代数和微积分，似乎就没有任何类似的书了。出于某种原因，我当时对此特别在意，以至于真的不怕麻烦自己动手写了本…
Years ago, I enjoyed reading books about how to do arithmetic mentally and quickly (there are several of them - one good one is "Math Magic" by Scott Flansburg). There did not seem to be anything equivalent for more abstract math, i.e. algebra and calculus. For some reason, I cared so much that I actually took the trouble to write a couple…
让我想起了我小时候最喜欢的书之一 - https://www.amazon.com/Math-Magic-Everyday-Problems-Revised/...
reminds me of one of my favorite books from when I was a kid - https://www.amazon.com/Math-Magic-Everyday-Problems-Revised/...
Math magic Https://www.amazon.com/Math-Magic-Calculator-Everyday-Problems/dp/0688104762
Math magic Https://www.amazon.com/Math-Magic-Calculator-Everyday-Problems/dp/0688104762