※ 引述《chilis (chilis)》之铭言： : 涛涛版31套~ : Q27: : For each landscaping job that takes more than 4 hours, a certain contractor : charges a total of r dollars for the first 4 hours plus 0.2r dollars for each : additional hour or fraction of an hour, where r > 100. Did a particular : landscaping job take more than 10 hours? : (1) The contractor charged a total of $288 for the job. : (2) The contractor charged a total of 2.4r dollars for the job. : ---------------------------------------------------------------------------------------------------------------------- : Answer: B (1)不能判断是因为原题只说r>100，没说上限 所以288究竟是多少的r是不能肯定的 相对之下，(2)可以明确的指出是4+7小时，所以一定超过 : Q28: : In the rectangular coordinate system, points (4, 0) and (– 4, 0) both lie on : circle C. What is the maximum possible value of the radius of C ? : A. 2 : B. 4 : C. 8 : D. 16 : E. There is no finite maximum value. : ---------------------------------------------------------------------------------------------------------------------- : Answer: E 简单的说，因为题目问的是最大半径 而依原题，任何Y轴上的点都可能是圆心，所以没有半径的最大值 : Q30: : A train traveled from station X to station Y at a constant speed of 88 feet : per second. Is the distance that the train traveled from station X to Station : Y greater than 40 miles? (1 mile = 5,280 feet) : (1) It took less than 45 minutes for the train to travel from station X : to Station Y. : (2) It took more than 42 minutes for the train to travel from station X : to Station Y. : ---------------------------------------------------------------------------------------------------------------------- : Answer: B Answer: B 这一题好像是10月的机经?(小弟11/6考试的时候似乎有遇到这一题) 先计算火车跑1mile要的时间 5,280/88=60(秒)=1分 所以要跑40mile需要40分钟 (1)的条件无法肯定Y>40，但(2)就明确的说至少要42分钟 --

※ 发信站: 批踢踢实业坊(ptt.cc) ◆ From: 123.193.198.157