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题库 / GMATAdvanced-DS-18
Is -3≤x≤3
(1) x2+y2=9
(2)x2+y ≤9
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： x^2+y^2-9=0
x^2-y^2=9+y^2
(x+y)(x-y)=(3+y)(3-y)
x=3 有结论。
2： 没有y,无法得出结论
选A
x^2-y^2=9+y^2 这个是怎么得的呀？
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