推 giyoshi:_____r_______s___t__0______-s 08/26 12:49
_____r__________s___t_______
On the number line shown, is zero halfway between r and s ?
(1) s is to the right of zero.
(2) The distance between t and r is the same as the distance between t and -s.
答案:C
但為何B獨立不充分？
PP解釋看不太懂...
請大家幫忙解一下條件2...
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