GWD数学一道

jbc88

Q28:
Last Sunday a certain store sold copies of Newspaper A for $1.00 each and copies of Newspaper B for $1.25 each, and the store sold no other newspapers that day.  If r percent of the store’s revenues from newspaper sales was from Newspaper A and if p percent of the newspapers that the store sold were copies of newspaper B, which of the following expresses r in terms of p?

A.    100p / (125 – p)
B.    150p / (250 – p)
C.    300p / (375 – p)
D.    400p / (500 – p)
E.    500p / (625 – p)

jbc88

For a nonnegative integer n, if the remainder is 1 when 2ⁿ is divided by 3, then which of the following must be true?





I.n is greater than zero.

II.3ⁿ = (-3)ⁿ

III.√2ⁿis an integer.





A.I only

B.II only

C.I and II

D.I and III

E.II and III

jbc88

UP

magicstar

The second one , I chose E.
When n is even, such as 0,2,4,6,8...the remainder is 1 when 2^n is divided by 3.
n can be zero. I fail ,II and III can be true. welcome criticism.

magicstar

第一道，LZ 抄错题了吧，我找的题是
Last Sunday a certain store sold copies of Newspaper A for $1.00 each and copies of Newspaper B for $1.25 each, and the store sold no other newspapers that day. If r percent of the store’s revenues from newspaper sales was from Newspaper A and if p percent of the newspapers that the store sold were copies of newspaper A, which of the following expresses r in terms of p?
A. 100p / (125 – p)
B. 150p / (250 – p)
C. 300p / (375 – p)
D. 400p / (500 – p)
E. 500p / (625 – p)

OA is D.

zgy32041

Q28:
Last Sunday a certain store sold copies of Newspaper A for $1.00 each and copies of Newspaper B for $1.25 each, and the store sold no other newspapers that day.  If r percent of the store’s revenues from newspaper sales was from Newspaper A and if p percent of the newspapers that the store sold were copies of newspaper B, which of the following expresses r in terms of p?

A.    100p / (125 – p)
B.    150p / (250 – p)
C.    300p / (375 – p)
D.    400p / (500 – p)
E.    500p / (625 – p)

-- by 会员 jbc88 (2010/10/23 15:22:05)

这道题答案是哪个？？请楼主确认题目有没有错误，貌似求不出正解

zgy32041

第一道，LZ 抄错题了吧，我找的题是
Last Sunday a certain store sold copies of Newspaper A for $1.00 each and copies of Newspaper B for $1.25 each, and the store sold no other newspapers that day. If r percent of the store’s revenues from newspaper sales was from Newspaper A and if p percent of the newspapers that the store sold were copies of newspaper A, which of the following expresses r in terms of p?
A. 100p / (125 – p)
B. 150p / (250 – p)
C. 300p / (375 – p)
D. 400p / (500 – p)
E. 500p / (625 – p)

OA is D.

-- by 会员 magicstar (2010/10/23 17:11:39)

原来是抄错题了。。这个LZ浪费了我将近半个小时。。。试了各种方法

magicstar

呵呵～ 我也算了许久

jbc88

。。。。复制下来的。。

jbc88

不会吧。。我复制下来的