想不通,请求指点!
If *represents one of the operations +,-and x,is K*(L+M)=(K*L)+(K*M) for all numbers K,L and M?
(1) K*1 is not equal to 1*K for some numbers K.
(2)* represents subtraction.
解释里有K-(L+M)=(K-L)+(K-M),)可是(K-L)+(K-M)=2K-(L+M)
不是K-L-M吗?
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LZ到数学JJ专区问一下,回复会很及时.
谢谢!!我真糊涂
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