Re: [計量] If a rectangular picture that ...
※ 引述《mlhchc (追求簡單的幸福)》之銘言：
: 請教3題數學
: if a rectangular picture that measures 4 feet from side to side
: is hung exactly in the middle of a rectangular wall that measures
: 13 feet from side to side, then the left edge of the picture is
: how many feet from the left edge of the wall?
: (A) 2.0
: (B) 3.0
: (C) 4.5
: (D) 6.5
: (E) 9.0
: Ans: (C)
13
__________________________ 所求=(13-4)/2=9/2=4.5
1 4 1
1 ----- 1
1 l l 1
1 ----- 1
1__________________________1
: If the length of each of the sides of three square garden plots is
: increased by 50%, by what percent is the sum of the areas of the
: three plots increased?
: (A)375%
: (B)200%
: (C)150%
: (D)125%
: (E)50%
: Ans: (D)
以其中一個正方形為例
設原本的正方形邊長為x 所以面積為x^2
若邊長增加50%->1.5x 面積變成2.25x^2
所以增加之%數為 2.25-1=1.25=125%
: The sum of n different positive integers is less than 100.
: what is the greatest possible value of n?
: (A) 10
: (B) 11
: (C) 12
: (D) 13
: (E) 14
: Ans: (D)
n(n+1)/2<100 n(n+1)<200 又13*14=182 14*15=210
所以 n=13
: 和下面一行句子意思,謝謝!
: for which category listed below are three only two other categories
: ^^^^^^^^^^^^^^^^^^^^^這句意思是?
: on the graph with fewer rescue squad calls?
下面所列的項目中,何者的救援大隊電話數目只有另外其中兩個項目比它少的
=>選擇救援大隊電話數目倒數第三多的
(應該不是three而是there @@)
大概是這樣吧
(sorry 翻譯翻得很爛)
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