2. 外语
  3. R= {3,4,7,9} T= {2,5,8} If a number r is to be chosen from set R and a number t is to be chosen from set T, what is the ranges o

R= {3,4,7,9} T= {2,5,8} If a number r is to be chosen from set R and a number t is to be chosen from set T, what is the ranges o

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问题 R= {3,4,7,9}
T= {2,5,8}
If a number r is to be chosen from set R and a number t is to be chosen from set T, what is the ranges of all possible values of t/r
选项 A、2/9
B、13/9
C、22/9
D、11/3
E、14/3
答案C
解析 极差中只需找出最大值和最小值。最大值：分子最大，分母最小，为8/3。最小值：分子最小，分母最大，为2/9。其差为22/9，故答案为C。
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