如果°代表+,-,×其中一个操作
k°(e + m)=(k°i)+(k°m)为所有数字k,£,m 是否成立?（这行确定没打错?如果e变成i,就成立）
(1)对某些数字k,k°1不等于1°k.
(2)°代表减法
一道GMAT数学题if ° represents one of the operations +,- ,and x,is
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