
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.
(1):KLMN的周长是30,不能得出KN和MN的比例关系,所以条件1单独不充分
(2):a=2b,KN=a, MN=a+b, 知道了a和b的比例关系,所以条件2单独充分
感觉不是面积相同而是这三个长方形是完全一样的来解释(2)
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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ythen 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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