※ 引述《mlhchc (追求简单的幸福)》之铭言： : 请教3题数学 : 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) 以其中一个正方形为例 设原本的正方形边长为x 所以面积为x^2 若边长增加50%->1.5x 面积变成2.25x^2 所以增加之%数为 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,谢谢! : for which category listed below are three only two other categories : ^^^^^^^^^^^^^^^^^^^^^这句意思是? : on the graph with fewer rescue squad calls? 下面所列的项目中,何者的救援大队电话数目只有另外其中两个项目比它少的 =>选择救援大队电话数目倒数第三多的 (应该不是three而是there @@) 大概是这样吧 (sorry 翻译翻得很烂) --

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