教科书对学生来说,是知识的主要源泉之一,但在今天各科使用的教本,有的还或多或少地存在着一些问题。现在我对刘薰宇编的解析几何下册(人民教育出版社出版)有下面几点意见:(1)在109节橢圆中,FA’/KA’=e 应改为 A’F/KA’=e,因 e 是正的;且如此可与以下的 A’F=e.KA’一致。(2)116节中,a 宜固定为半长轴,b 为半短轴,则焦点在从坐标轴上的橢圆方程为 x~2/b~2+y~2/a~2=1,这样较简便且不易弄错, Textbooks are one of the main sources of knowledge for students. However, some of the textbooks used today by various subjects still have some problems. Now I have the following comments on the Analytical Geometry Book (published by People’s Education Press) edited by Liu Xunyu: (1) In the ellipse of 109, FA’/KA’=e should be changed to A’F/KA’= e, because e is positive; and so can be consistent with A’F=e.KA’ below. (2) In section 116, a should be fixed to the semi-major axis and b to the semi-minor axis. Then the elliptic equation with focus on the coordinate axis is x~2/b~2+y~2/a~2=1 This is easier and not easy to mistake.