PREP DS -11 求教

maggiecookies

11.   959-!-item-!-187;#058&000583???????

If p is a positive odd integer, what is the remainder when p is divided by 4 ?

 

 

(1) When p is divided by 8, the remainder is 5.

 

 

(2) p is the sum of the squares of two positive integers.

 

 

 

 

(1) 可以,

(1) 可以,

  (2)?/ 怎么算出来, (2) 不行的, 9+4/4.   25+4/4,  余1,  49+4/4, 余 3 啊

  (2)?/ 怎么算出来, (2) 不行的, 9+4/4.   25+4/4,  余1,  49+4/4, 余 3 啊

 可是答案给的是D 啊?

 可是答案给的是D 啊?

23.   1653-!-item-!-187;#058&000843

At least 100 students at a certain high school study Japanese. If 4 percent of the students at the school who study French also study Japanese, do more students at the school study French than Japanese?

 

(1)  16 students at the school study both French and Japanese.

 

(2)  10 percent of the students at the school who study Japanese also study French.

4 percent of the students at the school who study French also study  Japanese 的意思是  占学法语 4%  的人学日语吗?  

联合条件2的意思是不是: 4% F= 10% J

  麻烦解答, 非常感谢

 

[此贴子已经被作者于2008-8-4 16:20:16编辑过]

paulstars

p为odd，根据2），可以确定一定是“奇数的平方+偶数的平方”

设p=（2n）^2 +(2m+1)^2

[此贴子已经被作者于2008-8-4 16:38:14编辑过]

genebaobao

49+4/4=53/4=13...1

maggiecookies

晕~~  , 我做DS 超级不清醒, 谢谢楼上的

fanshiyou

the students at the school who study French also study Japanese 这句话可以改为 the students who study French also study Japanese at the school. 意思是在所有学习法语的人中有百分之四也学日语．

maggiecookies

楼上解释得很清楚, 看来还有语法问题,   谢谢啦