The Leanpub 60 Day 100% Happiness Guarantee
Within 60 days of purchase you can get a 100% refund on any Leanpub purchase, in two clicks.
See full terms...
EMBARGO!
Journalists and bloggers: please do not publish anything about this until the embargo is lifted!
Please contact the author for more information about when this is.
镜心高中数学复习系列丛书 - 充分必要条件
Zhimin Zhan and 
詹远平数学是中学的一门重要学科，越来越受到家長和学生的重视，很多学生花了大量的时间和精力，也做了不少习题，但效果往往不够理想。数学成绩上 不去，既影响到学习数学的，信心，也影响到其他学科的学习。其实学好数学并不难，关键还是基礎概念，只要概念清楚，适当做一些习题便一通百通，数学概念相对其它学科并不多，灵活性虽然大一点，但把概念逐一搞清楚了，自然也就驾轻就熟了。
根据我几十年的教学经验，深知概念的重要性，本套丛书就是把高中数学的概念逐一剖析，以达到读者能融会贯通，所配备的练习也分若干层次，读者可以根据自己的水平自由选择。先做题后再看答案, 坚持下去，必有收获。
Interested in this book? Show your support by saying what you'd like to pay for it!
PDF
EPUB
About
About the Book
Feedback
Author
About the Authors
Zhimin Zhan
Zhimin Zhan is the founder and principal agile testing coach of AgileWay Pty Ltd, Australia. As an advisor and coach, he helps organisations implement test automation using Continuous Testing with open technologies, such as Selenium WebDriver / Appium. Zhimin is the creator of TestWise, the next-generation functional testing tool that supports functional test refactorings, and BuildWise, an international award-winning Continuous Testing Server. Zhimin is a frequent speaker and author of 14 books on software testing and programming. He shares his test automation and CI experience on Substack and Medium.
Earn $8 on a $10 Purchase, and $16 on a $20 Purchase
We pay 80% royalties on purchases of $7.99 or more, and 80% royalties minus a 50 cent flat fee on purchases between $0.99 and $7.98. You earn $8 on a $10 sale, and $16 on a $20 sale. So, if we sell 5000 non-refunded copies of your book for $20, you'll earn $80,000.
(Yes, some authors have already earned much more than that on Leanpub.)
In fact, authors have earned over $15 million writing, publishing and selling on Leanpub.
Learn more about writing on Leanpub
Free Updates. DRM Free.
If you buy a Leanpub book, you get free updates for as long as the author updates the book! Many authors use Leanpub to publish their books in-progress, while they are writing them. All readers get free updates, regardless of when they bought the book or how much they paid (including free).
Most Leanpub books are available in PDF (for computers) and EPUB (for phones, tablets and Kindle). The formats that a book includes are shown at the top right corner of this page.
Finally, Leanpub books don't have any DRM copy-protection nonsense, so you can easily read them on any supported device.
Learn more about Leanpub's ebook formats and where to read them
Write and Publish on Leanpub
You can use Leanpub to easily write, publish and sell in-progress and completed ebooks and online courses!
Leanpub is a powerful platform for serious authors, combining a simple, elegant writing and publishing workflow with a store focused on selling in-progress ebooks.
Leanpub is a magical typewriter for authors: just write in plain text, and to publish your ebook, just click a button. (Or, if you are producing your ebook your own way, you can even upload your own PDF and/or EPUB files and then publish with one click!) It really is that easy.