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Subject: Re: 中五 G.Maths MC份MOCK卷錯漏百出~


Author:
'薩殫'姆.侯賽因
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Date Posted: 23:32:34 03/18/03 Tue
In reply to: 5貓頭鷹 's message, "中五 G.Maths MC份MOCK卷錯漏百出~" on 02:03:58 03/18/03 Tue

>but 一個數take 左square 之後又會係負數
係complex no,你用計算機計下就知solve唔到ga la

>再根據5貓蛇提供---邊個出ga li份卷...叫佢黎做la~信唔信我放狗 吠吠吠..~~~""
係bbc出

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[> Subject: Re: 中五 G.Maths MC份MOCK卷錯漏百出~


Author:
Bobby仔
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Date Posted: 05:11:44 03/19/03 Wed

#14:
By the eq. 3X^2 + 3X + 1 = 0
A+B = -1, AB = 1/3
so (A-B)^2 = (A+B)^2 - 4AB = (-1)^2 - 4(1/3) = -1/3
答案無錯!

#51 真係有問題

#27
個問題係話Alternatively,所以當B擲完後,A再摘,所以個Probability係:
第1次B 贏's Probability : 1/4
第2次B 贏's Probability : 1/4 * 1/4
第3次B 贏's Probability : 1/4 * 1/4 * 1/4
and then去到無限,所以個Solution係GP Sum to Inf.(1st term is 1/4, common ration is 1/4)
即係a/(1-r) = (1/4)/(1- 1-4) = (1/4)/(3/4) = 1/3
答按都無錯喎

即係話你所指的三條,其實係得一條有問題,反而#39及#45就有問題...
[> [> Subject: Re: 中五 G.Maths MC份MOCK卷錯漏百出~


Author:
strange..
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Date Posted: 22:31:03 03/19/03 Wed

(A-B)^2 = -1/3 ?????????????!!!!!!!!!
[> [> [> Subject: y not?


Author:
z
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Date Posted: 00:08:38 03/20/03 Thu

complex number

i square 夠係 -1


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