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hijenny · 发表于 2010-7-3 07:50:38

5和11的圖在檔案裡

5.812-!-item-!-187;#058&000553

If
, then m =

(A) 17

(B) 18

(C) 34

(D) 35

(E) 36

9.1700-!-item-!-187;#058&001066

Last year the range of the annual salaries of the 100 employees at Company X was $30,000.If the annual salary of each of the 100 employees this year is 10 percent greater than it was last year, what is the range of the annual salaries of the 100 employees this year?

(A) $27,000

(B) $30,000

(C) $33,000

(D) $36,000

(E) $63,000

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【答案】C

【思路】Last year the range of the annual salaries of the 100 employees at Company X＝30,000（假設最大annual salaries=50,000,最小annual salaries=20,000）

又今年比去年annual salary漲10％表示the range of the annual salaries of the 100 employees this year=50,000x(1.1)-20,000x(1.1)=33,000

我的思路是30,000 乘以110/100=33000行嗎?

11.1799-!-item-!-187;#058&002415

In the figure above, the radius of the circle with center O is 1 and BC = 1.What is the area of triangular region ABC ?

(A)√2/2

(B)√3/2

(C) 1

(D)√2

(E)√3

wiseric · 发表于 2010-7-3 11:10:39

If , then m =

(A) 17
(B) 18
(C) 34
(D) 35
(E) 36

答案 D 35
过程原式左边=5^(-m) + 2^(-36) 原式右边=1/2**(1/10)^35= 2^(-1)* (2*5)^(-35)
两边约去2的-1次方等于 5^(-m) + 2^(-35) = （2*5）^(-35)
5^(-m) + 2^(-35) = 2^(-35) * 5^(-35)
两边约去2的-35次方直接可得m=35

Last year the range of the annual salaries of the 100 employees at Company X was $30,000.If the annual salary of each of the 100 employees this year is 10 percent greater than it was last year, what is the range of the annual salaries of the 100 employees this year?

(C) $33,000

简单的做法设去年最低的是X 最高的 X+30 那么他们今年的工资都是递增的，增幅10%
所以去年最低的，今年就是X(1+10%)=1.1x 去年最高的，今年就是（1+10%）（X+30）=1.1X+33
两者相减就是33咯，也就是33,000

In the figure above, the radius of the circle with center O is 1 and BC = 1.What is the area of triangular region ABC ?

(B)√3/2

因为AC过圆心，是直径，直径所对应的角ABC就是直角。AC斜边2，一条直角边是1，勾股定理，得AB=√3/2。
面积就是√3/2

hijenny · 发表于 2010-7-3 19:49:13

感謝這位戰友
想再請問一題

40.3636-!-item-!-187;#058&003488

Beth's bank charges a service fee on a regular checking account for each month in which the balance on the account falls below $100 at any time during the month.Did the bank charge a service fee on Beth's regular checking account last month?

(1)During last month, a total of $1,000 was withdrawn from Beth's regular checking account.

(2)At the beginning of last month, Beth's regular checking account balance was $500.

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【答案】E

【思路】

(1) We do not know the beginning account, so we cannot know this answer---------insufficient

(2) We do not know how much Beth withdraw or deposit -------------------------------insufficient

(1)(2)We do know how much Beth deposit-------------------------------------------------insufficient

我的答案是C
AB 一定不充分
可是C 不是知道了原先500元之後扣掉1000就低於100要收費了嗎?
還是我會錯意了?

icyblue · 发表于 2010-7-4 15:13:27

楼主是有PP的数学破解版本么？可否上传共享一下呢？
或者烦请发发邮件， stella-black(ａ) 163.com

多谢！

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