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其他   题数:500
A certain list consists of 400 different numbers. Is the average (arithmetic mean) of the numbers in the list greater than the median of the numbers in the list?(1 ) Of the numbers in the list, 280 are less than the average.(2) Of the numbers in the fist, 30 percent are greater than or equal to the average.
If abc≠0 , is ab c =abc ?(1) a = 1 C(2) C = 1
If w + z = 28, what is the value of wz ?( 1) w and z are positive integers.(2) w and z are consecutive odd integers.
In the figure above,the shaded region represents the front of an upright wooden frame around the entrance to an amusement park ride. If RS= 5√32 meters. what is the area of the front of the frame?(1)x=9 meters.(2)ST=2√3 meters
If x2=2x , what is the value of x ?( 1) 2x=(x2 )3 (2 ) x=2x−2 ​
In the figure above,B is on AC , D is on AE , AB has the same length as BC ,and ∠ABD has the same measure as ∠ACE. What is the length of DB ?(1)The length of EC is 6.(2)The length of DE is 5.
The cardinality of a finite set is the number of elements in the set. What is the cardinality of set A?(1) 2 is the cardinality of exactly 6 subsets of set A(2) Set A has a total of 16 subsets, including the empty set and set A itself.
In a two-month survey of shoppers, each shopper bought one of two brands of detergent, X or Y, in the first month and again bought one of these brands in the second month. In the survey, 90 percent of the shoppers who bought Brand X in the first month 1 bought Brand X again in the second month, while 60 percent of the shoppers who bought Brand Y in the first month bought Brand Y again in the second month. What percent of the shoppers bought Brand Y in the second month?( 1) In the first month, 50 percent of the shoppers bought Brand X.(2) The total number of shoppers surveyed was 5,000.In a two-month survey of shoppers, each shopperbought one of two brands of detergent, X or Y, in thefirst month and again bought one of these brandsin the second month. In the survey, 90 percent ofthe shoppers who bought Brand X in the first month1 bought Brand X again in the second month, while60 percent of the shoppers who bought Brand Y in thefirst month bought Brand Y again in the second month.What percent of the shoppers bought Brand Y in thesecond month?( 1) In the first month, 50 percent of the shoppersbought Brand X.(2) The total number of shoppers surveyed was5,000.
Patricia purchased x meters of fencing. She originally intended to use all of the fencing to enclose a square region, but later decided to use all of the fencing to enclose a rectangular region with length y meters greater than its width. In square meters, what is the positive difference between the area of the square region and the area of the rectangular region?(1)xy=256(2)y=4
If 1/4 of the larger of two numbers is greater than 5 times the smaller of the same two numbers, is the smaller number less than 4?(1) The larger number is greater than 70.(2) The larger number is less than 80.
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