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֫hרעرǿһʼˢ⣬ȫĶĿϡ
Լûˣ̧ͷֻĻ
֫h߿⣬ĿƺܺãرӢƵĻ֪ʶʵżһ¡
ͱǰ⣬Сʣһʣһֱûʲôͷ
xֲpx=1=1-px=0
ȥģ⣬ѶϤС
֫hϲʲô츳ѡֻ֣ŬͶ͵ȡ
ԣҪڸ߿֮ʣı飬֪ῼЩ͡
һ⣬ס
֫hҧָĻﻭͿͿ㡣
ӣһֻǽ޳ָӳĻϵ˵㡣
ԵƵɤ֫hߡ
e(y)=a1+a2+a3an
=6/1(5/2)0+5/2)1(5/2)n-1+3/n

лôһѣ֫hඥ
3/n+18/5-9/1x(5/2)n-1

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