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题库 / GMATAdvanced-DS-21
Is x2-y2 a positive number?
(1)x-y is a positive number.
(2)x+y is a positive number.
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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错选B==
x+y>0，也有可能x-y<0，比如-1+6
所以两个条件成立才可以，C
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