※ 引述《Linbookhow (寂寞黑丝袜)》之铭言：
: ※ 引述《GOKU123 (GOKU)》之铭言：
: : p.166
: : 第25题
: : A rectangular floor with an area of 12 square meter is drawn to scale with 2
: : centimeters representing L meter.
: : QA: The area of scale drawing of the floor OB: 24 square centimeters
: : Ans: (A) QA>QB
: : 问题: 如果把 2 cm 缩小为 L m, 设原图形两边长为x,y. 新图型的边长应为2x/L,2y/L
: : xy=12 那面积变成4xy/L^2 = 48/L^2 那么大小不就取决于L? 答案应该是(D)?
: : p.255
: : 第6题 比大小
: : For the line with equation y-ax+b, ab≠0,
: : the x-intercept is twice the y-intercept.
: : QA:The slope of the line OB:1/2
: : 答案是B
: : 问题是:X截距为Y截距两倍，斜率不是应该会有正或负?感觉斜率应该是±1/2?
: 截距有正有负，如果斜率为正的话，这条直线的X截距与Y截距一定是一正一负，
: 怎么样都不可能有二倍的关系！
可是截距的定义是绝对值阿！？
没有正负号的问题～
陈向东这一题给错答案了吧？
: : p.257
: : 第17题
: : In the xy-plane, line k is a line that does not pass through the origin.
: : Which of the following statements individually provide(s) sufficient
: : additional information to determine whhether the slope of line k is negative?
: : Indicate all such statements.
: : (A) The x-intercept of line k is twice the y-intercept of line k
: : (B) The product of the x-intercept and the y-intercept of line k is positive.
: : (C) Line k passes through the points(a,b) and(r,s), where(a-r)(b-s)<0
: : Ans:ABC
: : 问题:(A)里面 同样截距是两倍，斜率应该会是有正有负吧?
: 理由同上！
: : p.258
: : 第20题
: : If the total of commuters to Country W is twice the number to Country Z, and
: : if the average number of vehicles that transport commuters daily to Country W
: : is 30,000, what is the approximate average number of vehicles that transport
: : commuters daily to Country Z?
: : Ans:(A) 12,000
: : 问题:本题有附图，但我觉得题目跟图表无关
: : 算法为:total=average*days 而days为常数,
: : 所以 total(W)为total(Z)的两倍;那average(Z)就应该是average(W)的1/2
: : 30000/2=15000