题库搜索>数据充分DS-17964
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Patricia purchased x meters of fencing. She originally intended to use all of the 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
分析A选项
分析B选项
分析C选项
分析D选项
分析E选项
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条件二：
①因为长方形和矩形的周长相等
所以设长方形的宽为a，则长为a+y，周长=4a+2y=正方形的周长
②正方形的边=（4a+2y）/4=a+y/2，面积=a^2+ay+y^2/4
③长方形的面积=a^+ay
④因为题目要我们求的是difference between the area of the square region and the area of the rectangular region
所以就是（a^2+ay+y^2/4）-（a^+ay）=y^2/4，所以只需要知道y的值即可，充分。
fugace.s
太坑了 题目里设的x完全没用啊
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2022-11-22 21:13:42
Ryan_x97
x刚好够用，没有剩余吗
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2022-09-03 23:15:52
willowX
length y meters greater than its width意思是长比宽多y！设数只能设短为n，长为n+y，再使用周长为x来将n表示出来。最后正方形面积（x/4）^2，而长方形面积为(x-2y)/4乘(x-2y+4y)/4。二者做差，化简得y^2/4，即只需要知道y即可
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2022-09-02 21:46:10
66miao
x米围栏，正方形边长就是x/4, 面积是 (x/4)^2; 长方形长是 x/4 + y/2, 宽是 x/4 - y/2，面积是 （x/4 + y/2）*（x/4 - y/2）= (x/4)^2 -(y/2)^2； 正方形长方形面积差 = (x/4)^2 -(y/2)^2 - (x/4)^2 = (y/2)^2；所以只要知道y就能解。 B
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2022-05-23 16:12:04
睿旋必须得行
看成圆形了 我傻了
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2021-11-03 21:32:38
221555tvgl回复睿旋必须得行
加一
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2021-11-28 21:27:44
水寒528
S1-S2=y^2/4所以B正确
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2021-09-18 09:28:00
173993qp
两个图形的周长相等，设长方形的宽为a，则长为a+y，周长=4a+2y=正方形的周长。正方形的边=a+y/2，面积=a^2+ay+y^2/4,而长方形的面积=a^+ay,差y^2/4,所以只需要知道y的值即可
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2020-12-02 16:08:12
凡人L
有第二个条件最后得出的表达式为：仅含有x的表达式；而这里的x作为题干中所给的已知量，因此条件二sufficient
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2020-08-09 22:38:09
416348tqhf回复 凡人L
如果X是题目已给的已知量，条件一也是sufficient，y=256/x, 乱答一通
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2021-01-17 12:19:11
wordy要你吗回复凡人L
不是的bro
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2022-09-22 18:08:59
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数据充分DS
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