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41、X是否满足:0
(1)X^2 3次根号X;
(2)X^3 3次根号X;
【答案】A
【思路】
看(1),x一定大于0,所以0
看(2),0
42、S是一个数列(A1,A2,,An),可否求出数列的标准方差?
(1)每个数相等;
(2)数列的算术平均数是7;
【答案】A
【思路】每个数相等,那么标准方差为0
只知道数列的算术平均数,不知各数的离散程序,无法求出标准方差.
43、TU是个两位数(T是十位数,U是个位数)。TU is twice product of these digits, U=?
【答案】6
【思路】由题意,10T+U=2TU--
U=10T/
U=10T-5+5/
U=5+)
又,由U,T的定义域可得T=3,U=6。
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