一道GMAT数学题if°representsoneoftheoperations+,-,andx,isk°(e+m)=(k°i)+(k°m)forallnumbersk,£,and(1)k°1isnotequalto1°kforsomenumbersk.(2)°representssubtraction.

Question

一道GMAT数学题
if ° represents one of the operations +,- ,and x,is
k°(e+m)=(k °i)+(k °m)for all numbers k,£,
and
(1) k ° 1 is not equal to 1 ° k for some numbers k.
(2) ° represents subtraction.

Answer 1

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