25) x, y, z are primes, x^3*y^3*z^3=? a) x^3*y*z=728; b)x^2=... (A)
Answer: E
x^3*y*z=728----2^3*13*7,,,and x, y, z are primes,then X=2,y*z=13*7
answer maybe A
26) 53 is the standard deviation of T(一数列) greater than S(一数列) ?
(1) mean of T is greater than that of S
(2) median of T is greater than that of S
Answer: A
疑惑，请高手指导作者: tongxun 时间: 2003-4-1 21:29
25、A
这个题目怎么着也不能是E
26、E
只知道方差而已，而数列中的数字大小、差别都不知道，怎能的出A？
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