[DSE 2020] 同學仔開始溫你嘅數學未？ [2]

或者就這樣吧 2020-4-13 19:47:48 17年個條應該唔洗用都會做到掛

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都係一part一part咁guide住

王元姫無慘 2020-4-13 19:51:16 其實係

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btw 呢份係咪學X社嘅mock

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可唔可以幫我含 2020-4-13 20:02:51 巴打想g依家操ppA1 2之外仲使唔使做啲額外野

迎賓接福 2020-4-13 20:13:18 其實都冇

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不斷操起碼兩三次
做齊dse (sp, pp, 12-19)
可以做埋ce (最近10年到, e.g. 00-11)
有時間就埋坊間啦
初中topic我覺得坊間嗰啲ok

迎賓接福 2020-4-13 20:15:43 *做埋坊間

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會考都無C 2020-4-13 20:16:47

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或者就這樣吧 2020-4-13 21:40:12 係呀

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計時做個陣呢part諗左四個字都唔識

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王元姫無慘 2020-4-13 21:42:54 學X社啲mock離地開

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或者就這樣吧 2020-4-13 22:10:45 還可以啦不過你講完我先發現到佢每一年既19題都係抄返上一年dse出既topic

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當練下手都唔錯既
始終dse玩左都就黎十年可見既將來難度都只會越黎越深

銀影 2020-4-13 22:24:24

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轉下topic先

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已閱 2020-4-13 22:38:59 又係concyclic

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btw 下下靠textbook真係會死人

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FinalA+ 2020-4-13 22:46:05 咩叫equation(s) of the graph

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夢追人 2020-4-13 22:57:01 應該係equation of locus之類嘅意思

陪跑員 2020-4-13 23:15:20

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陪跑員 2020-4-13 23:19:55

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會考都無C 2020-4-14 00:55:33 等睇答案

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或者就這樣吧 2020-4-14 01:01:16

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迎賓接福 2020-4-14 01:35:11 (a)
The graph drawn is a circle
passing through A, B, C

(b)
Let P be the centre
ACB is the angle at circumference
APB is the angle at centre
APB = 2ACB = 60°
As AP = BP (radii), APB is equil.
Let P = (m,n)
Set two eqs using distance formula
Solving, (m,n) = (0,4) or (sqrt3, 1)
As radius = 2, required equations are
x^2 + (y-4)^2 = 4
or (x-sqrt3)^2 + (y-1)^2 = 4

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迎賓接福 2020-4-14 01:49:11 改少少

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(a) major arc AB of the circle
passing through A, B, C

(b) 最尾嗰兩條equation個domain
剔番走個minor arc

英雄見参 2020-4-14 01:58:47 唉屌
我有數想問都唔好意思問啦
你班老屎忽玩得咁開心

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英雄見参 2020-4-14 02:00:26 上個post半年先推爆
今個post又會咁撚快嘅

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迎賓接福 2020-4-14 02:02:00 問啦

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英雄見参 2020-4-14 02:20:54 (out C /DSE 雞唔洗睇)

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會考都無C 2020-4-14 02:26:56 條equation可能需要加返個restriction

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因為唔係一整個圓形

所以我先話等答案

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迎賓接福 2020-4-14 02:30:54 同意我上面改咗係major arc唔係circle
條equation用半圓再限個domain