5个点ABCDE依次排列在一条直线上,线段AD=4.5,线段BE=3.5,线段CD=2,那么线段BC可能的长度是多少?
应该是给了你几个选项,让你选出可能是BC长度的那个.
画个图可以看出,BC的范围是：（0,1.5）,因为BC=0时BC重合,BC=1.5时DE重合,所以BC只能在这两个数之间,你可以选那个处于这个区间的选项.
Five different points A,B,C,D and E lie on a line in that or
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