茫茫换裤贴中请教数学题,gwd 5-4,28

tracytrace · 发表于 2010-8-22 10:40:59

Q4:
√[2√63 + 2/(8+3√7)] =

A.8 + 3√7
B.4 + 3√7
C.8
D.4
E.√7
Answer: D

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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)

Answer: D
均是怎么算都算不出来啊....

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)

Answer: D
均是怎么算都算不出来啊....

shingshinglee · 发表于 2010-8-22 14:07:25

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 A~（这个位置如果是A的话，就是D了吧？）, which of the following expresses r in terms of p?

Q4 1/(8+3(根号下7))=8-3(根号下7) 并且根号下63=3(根号下7) ~~可以看明白吧？

tracytrace · 发表于 2010-8-22 14:33:10

明了,连题出错了都能看出来,牛!

茫茫换裤贴中请教数学题,gwd 5-4,28

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