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题库 / GMATAdvanced-DS-66
If @ denotes a mathematical operation, does x@y=y@x for all x and y?
(1)For all x and y, x@y=2(x2+y2).
(2)For all y,0@y=2y2.
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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感觉（2）如果是0@y=2y^2+0，那就不成立了
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