Re: [計量] If 'x' and 'y' are integers ...
※ 引述《Ph7 (褪去色彩脫胎重生)》之銘言:
: 2. If 'x' and 'y' are integers between 12 and 30, then for (5+x)/(7+y)
: how many sets of x & y for the given expression will be having same ratio?
: ANS:2
不是非常確定 這是我猜測的意思和答案 如果有錯請指出 表達能力不是很好
請大家見諒了XD
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題義大概是指說 將x和y帶入後可使(5+x)/(7+y)的比值不變的x和y的解有幾組
先假設將x和y帶入後(5+x)/(7+y)=1
則可能的解有
x= 15 16 17 18 19 20 ..... 29
---------------------------------
y= 13 14 15 16 16 18 ..... 27
則有1組比值不變解
再來假設將x和y帶入(5+x)/(7+y)= 1/2
x= 13
--------
y= 29
則又有一組比值不變解
再來假設將x和y帶入(5+x)/(7+y)=1/3
則x=12時y會超過30
所以答案為(5+x)/(7+y)=1 和 (5+x)/(7+y)=1/2 兩組解
感謝大家 不好意思~~ 原PO其實是腦殘XD
跟大家一起討論答案真好XD
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推
12/10 22:18, , 1F
12/10 22:18, 1F
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12/10 22:26, , 2F
12/10 22:26, 2F
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12/10 22:30, , 3F
12/10 22:30, 3F
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12/10 22:45, , 4F
12/10 22:45, 4F
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12/10 22:50, , 5F
12/10 22:50, 5F
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12/10 22:52, , 6F
12/10 22:52, 6F
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12/10 23:05, , 7F
12/10 23:05, 7F
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12/10 23:07, , 8F
12/10 23:07, 8F
※ 編輯: leoion 來自: 59.112.32.200 (12/10 23:11)
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12/10 23:26, , 9F
12/10 23:26, 9F
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12/10 23:40, , 10F
12/10 23:40, 10F
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12/10 23:47, , 11F
12/10 23:47, 11F
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12/11 00:30, , 12F
12/11 00:30, 12F
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12/11 00:32, , 13F
12/11 00:32, 13F
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12/11 00:36, , 14F
12/11 00:36, 14F
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12/11 00:40, , 15F
12/11 00:40, 15F
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12/11 00:40, , 16F
12/11 00:40, 16F
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