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题库 / Prep2007E2-DS-53
The symbol @ represents one of the four arithmetic operations: addition, subtraction, multiplication, and division.
Is (5 @ 6) @ 2 = 5 @ (6 @ 2) ?
(1) 5 @ 6 = 6 @ 5
(2) 2 @ 0 = 2
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
EACH statement ALONE is sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient.
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(1) + *有结合律
(2) + -，-没有结合律
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