a) 13/27
b) 13/27
c) 1/3
d) 1/2
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同意你的答案(a)和 (b)-- 13/27
-Blue_Diamond-
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02/08/2011 postreply
18:18:51
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b)13/27 顯然太大.
-jinjing-
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02/08/2011 postreply
19:13:49
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我也不希望如此。可是,
-Blue_Diamond-
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02/08/2011 postreply
20:24:00
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2)27/196,有1/2一男一女,1/4二男,1/4二女.
-jinjing-
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02/09/2011 postreply
12:28:01
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再說答案你的(d)
-Blue_Diamond-
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02/08/2011 postreply
19:36:10
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關於你的題目(c)的前半部的答案:
-Blue_Diamond-
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02/08/2011 postreply
19:48:00
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關於你的題目(c)的疑問之一:
-Blue_Diamond-
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02/08/2011 postreply
20:18:21
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問得好
-wushuihe-
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02/09/2011 postreply
01:59:43
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改進後的問題(c)-- 就按家長任選一個孩子來回答
-Blue_Diamond-
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02/09/2011 postreply
20:24:52
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