微积分的实质是什么？

What's the calculus ? In Chinese, it means the differential and integral, and I think it is a real tool to solve problems in life and it is also an ability of analysis.

You can do some exercises and complete sone quiz to study it, remember:thinking is most important than others

微积分最基本的内容包括微分和积分两个方面，微分就是做差，积分就是求和。
一个是把整体细分，一个是通过微小的各部分累积得到整体。

通俗易懂且深刻~
刘里鹏.《从割圆术走向无穷小——揭秘微积分》，长沙：湖南科学技术出版社，2009