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题库 / GMATAdvanced-DS-47
Patricia purchased x meters of fencing. She originally intended to use all ofthe fencing to enclose a square region, but later decided to use all of the fencing to enclose a rectangular region with length y meters greater than its width. In square meters, what is the positive difference between the area of the square region and the area of the rectangular region?
(1)xy=256
(2)y=4
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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这道题是把x当做已知数吗？否则，为什么不需要（1）和（2）一起。我得到的结果是x^2/4pai+x^/16-y^2/4
square region是正方形区域
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