而且，用手绘草图，而不用绘图软件画出整洁的图呢？

And why hand sketching rather than a clean drawing from a drawing program?

youdao

草图 ，而不用绘图软件画出整洁的图呢？

Now sketch the graph of each of the functions in Problem I.

youdao

草图 ，而不用绘图软件画出整洁的图呢？

Now sketch the graph of each of the functions in Problem I.

youdao