GMAT数学DS题求解If .represent one of the operation + ,-,and x,is K.（L+M）=(K.L)+(K.M) for all number K,L,and 1)\x09K.1 is not equal to 1.K for some numbers K2)\x09.represents subtraction为什么答案选D,

GMAT数学DS题求解If .represent one of the operation + ,-,and x,is K.（L+M）=(K.L)+(K.M) for all number K,L,and 1)\x09K.1 is not equal to 1.K for some numbers K2)\x09.represents subtraction为什么答案选D,
GMAT数学DS题求解
If .represent one of the operation + ,-,and x,is K.（L+M）=(K.L)+(K.M) for all number K,L,and
1)\x09K.1 is not equal to 1.K for some numbers K
2)\x09.represents subtraction
为什么答案选D,

GMAT数学DS题求解If .represent one of the operation + ,-,and x,is K.（L+M）=(K.L)+(K.M) for all number K,L,and 1)\x09K.1 is not equal to 1.K for some numbers K2)\x09.represents subtraction为什么答案选D,
条件一表明.只能代表- 所以明确：以上式子不成立!
条件二和条件一一样……
SO,两个单独都可以,选D