9

The operation* represents either addition, subtraction, or multiplication of integers, what is the value of 1*0?

(1)   0*2=2 

(2)    2*0=2

l        Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient

l        Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient

l        BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

l        EACH statement ALONE is sufficient

Statements (1) and (2) TOGETHER are NOT sufficient

这道题答案是A ,可我觉得应该是E,2+ /-0=2,1+/-0=1呀.

请大家讨论

条件1单独成立，即可确定*代表“＋”。

条件2单独成立，*可能代表“＋”或“－”。

so A。

选D

条件一可以确定符号为＋，值为1

条件二可以确定符号为＋或－，值为1