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题库 / Prep2007E1-DS-81
In the figure above, what is the ratio ~$\frac{KN}{MN}$~ ?
(1) The perimeter of rectangle KLMN is 30 meters.
(2) The three small rectangles have the same dimensions.
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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这道题答案错了吗？
举例来讲，KN/MN=2/3 成立，KN/MN=4/9 也是成立的啊。。。
所以KN/MN的值不唯一吧？答案应该是E吧？
把dimension当成面积理解应该是E，dimesion还能有什么意思？
if 幾個長方形全等，設寬x，長y
then y=2x
而MN=x+y=3x
所以KN/MN=2/3
不清楚4/9是怎麼來的？
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