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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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不用纠结，条件二没有提及x的关系，则说明通过条件二无法确保x@y=y@x
【引用】
条件一，x@y=2(x^2+y^2),那么y@x=2(y^2+x^2),所以x@y=y@x；条件二，也没有出现X，判断不出
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