拜托各位大侠帮忙 教一下我这数学白痴.......
1. What was the temperature in degrees Celsius in City R at noon on a certain day?
(1)The temperature at 8:00 a.m. on that day was 40 oC, having dropped 2 degrees each hour during the four previous hours.
(2)Starting at 8:00 a.m., the temperature began to rise 2 degrees each hour until it reached 46 oC.
A):E
2. Is 1＞1/X ?
(1)1＞X (2)X＞0
A):C
4. Neither the numerator nor the denominator of a particular fraction is equal to zero. If the numerator and denominator are changed, by what percent does the fraction’s value change?
(1)The numerator is increased by 16 and the denominator is decreased by 20 percent.
(2)The numerator is increased by 16 and the denominator is decreased by 20.
A):A No/Do => N1/D2 *變化 後-前/前 X 100％
Organization A only B only C only A&B only B&C only A&C only
Number of Employees 7 8 9 2 3 4
5. At company X each employee belongs to at least one of three organizations, A, B, and C, as shown in the table above. What is the total number of employees at X?
(1)There are exactly 2 employees who belong to all three organizations.
(2)Exactly 11 employees belong to two or more of the three organizations.
A)
6. In a certain packinghouse, grapefruit are packed in bags and the bags are packed in cases. How many grapefruit are in each case that is packed?
(1)The grapefruit are always packed 5 to a bag and the bags are always packed to a case.
(2)Each case is always 80 percent full.
A):A
7. If a, b, and c are integers, is the number 3(a+b)+c divisible by 3?
(1)a+b is divisible by 3.
(2)c is divisible by 3.
A):B作者: robert 时间: 2003-6-2 11:17
答:
1.A,B都推不出结论，合在一起也推不出，所以选E
2. Is 1＞1/X ?
(1)1＞X (2)X＞0
选 C
思路:挺显然的.
4.注意"persent",所以选A
5. table呢？
6. B是推不出来的，A可以看出都放到a case,可以推出。
7. 非常简单，B作者: isuffering 时间: 2003-6-3 22:18
5. x=a+b+c-ab-ac-bc+abc, the each value of a, b, c, ab, ac, bc is given,
if we can get the value of ABC , then we can get the value of X
(1)abc=2, then the value of x is sure
(2)ab+bc+ac-2abc=11, then we can get ABC, then get X
That means (1)(2) each is sufficient alone.
Thus we get D.
6.
(the number of grapefruit )/bag * (the number of bag) / case =(the number of grapefruit) / case
(1)The grapefruit are always packed 5 to a bag and the bags are always packed * to a case.
I think * should be some number there, then we get A
If * is no word lost, then we get E.
1,2,4,7 is not difficult, think it over , u can get the answer.
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