2001/01-number 13

czlovegj

In geometry, an ellipe may be defined as the locus of all points---distances from two fixed pointsis constant.

A.which as the sum of

B.of the sum which

C.whose sum of whose

D.whose sum that the

can any bull-buddy explain what meaning is the word "constant"

please i'll take off my hat first

likui

constant是【固定不变的】意思。

这是一个几何定义，就是说，椭圆可以定义为其上所有的点到固定两点的距离的和是固定不变的。