that is life ..isn't it , not does everything in our expectation
anyway your problem
1. 1/2-1/4+1/8-...-1/(2^9)+1/(2^10)
since the 2Nth number is smaller than the 2(n+1)th
the fomula can be rewritten this way
1/(2^2)+1/(2^4)+1/(2^6)+1/(2^8)+1/(2^10)
the under limit is 1/4
the sum of the consequence is a1=1/4 q=1/4
S( the upper limit , as N is a infinite number )= (1/4)/[1-(1/4)]=1/3
therefore the range is 1/4-1/3
2。温度计的一题。 从上这下W,X,Y,Z四个字母,w和x之间有2个刻度,x和y之间有三个刻度,y和z之间有2个刻度,z下面有一个刻度,每个刻度相同。求W值为多少
1。x+y=a
2.z+w=b(注:a和b为具体数据,记不起来了)
------------
from the problem
w
#
#
x
#
#
#
y
#
#
z
#
then x-y=4
w-z=10
given 1) or 2) only we can get all of the number , therefore I think D is the answer
however , does the problem mentioned that these numbers are all integers ?
open to discussion
^^作者: nobodytest 时间: 2003-1-28 10:50
1.1/4-1/3
2.depends on the value of a&b
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