4.4 分手成功， 放狗（有考古）

nyonko

今日分手成功，回馈CD～～


AWA： MarketCO

Q：考了灯塔下小男孩反向走，影子移动的速度。答案1/2
考了DS 第一象限圆的圆心（a,b）,求r. 1)知a,b值 2）圆离原点最近距离为6.答案C

纸箱展开算周长那题，有图。原狗主画图中的打开方式正确。

V
考了一道prep原题。
Radio stations with radio data system (RDS) technology broadcast special program information that only radios with an RDS feature can receive. Between 1994 and 1996, the number of RDS radio stations in Verdland increased from 250 to 600. However, since the number of RDS-equipped radios in Verdland was about the same in 1996 as in 1994, the number of Verlanders receiving the special program information probably did not increase significantly.

Which of the following is an assumption on which the argument depends?

A. few if any of the RDS radio stations that began broadcasting in Verdland after 1994 broadcast to people with RDS-equipped radios living in areas not previously reached by RDS stations.

B. In 1996 most Verdlanders who lived within the listening area of an RDS station already had a radio equipped to receive RDS.

C. Equipping a radio station with RDS technology does not decrease the station’s listening area.

D. In 1996 Verlanders who did not own radios equipped to receive RDS could not receive any programming from the RDS radio stations that began broadcasting in Verdland after 1994.

E. The RDS radio stations in Verdland in 1996 did not all offer the same type of programming.


不确定问题是不是一样。我记得是问加强……


所以大家prep也要好好做！
祝所有CDer早日分手成功！！
谢谢大家～～～

michellezeng

请问影子1/2是怎么算出来的？

xiaoying2015

恭喜楼主成功分手　。。。　

michellezeng

请问影子1/2是怎么算出来的？

michellezeng

请问影子1/2是怎么算出来的？

张大白白白

求教影子那道题目解法

吳縣大

张大白白白 发表于 2016-4-5 07:20
求教影子那道题目解法

燈塔高25ft
男孩高5ft

所以(聽說題目有給圖，告訴你從相似三角形得到的邊長比例)
(男孩到燈塔腳的距離)：影長=(25-5):5=4:1

所以影子變化的速度是男孩走向/靠近燈塔速度的1/4
題目有說男孩走路的速度是2，所以影子變長/縮短的速度是0.5

maggieshoo

吳縣大 发表于 2016-4-5 10:14
燈塔高25ft
男孩高5ft

（25-5):5 为什么是25-5阿？？

chasedreamv

感谢分享！               

FrankieXiong

那个数学是确定圆在第一象限，而不是圆心吗？

谢谢回答啦！