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标题: 一道難題 [打印本页]

作者: loyse66328 时间: 2003-6-1 18:59 标题: 一道難題

When 2/9 of the votes on a certain resolution have been counted, 3/4(四分之三)
Of those counted are in favor the resolution. What fraction of the remaining votes must be against the resolution so that the total count will result in a vote of 2 to 1 against the resolution?
A. 11/14 (14分之11)
B. 13/18
C. 4/7
D. 3/7
E. 3/14
答案為 A.
題目看不太懂，有人能列式子嗎，謝啦

作者: douzeyun 时间: 2003-6-1 22:18

总量2比1的反对比同意。令剩下部分中反对的为x.
(2/9*3/4+7/9*(1-x))=1/2*(2/9*1/4+7/9*x)

作者: oddyuibe 时间: 2003-6-2 00:05

同意楼上的解法~

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