[計量] PP_DS題詢問
The points A, B, C, and D are on a number line, not necessarily in that order.
If the distance between A and B is 18 and the distance between C and D is 8,
what is the distance between B and D?
(1) The distance between C and A is the same as the distance between C and B.
(2) A is to the left of D on the number line.
不知道我算的對不對，(1)的話，算出the distance between B and D is 1 or 17.
假設我算對的話，則可以確定距離不是1就是17的話，
這樣算是充分還是不充分呢?
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