[DSE數學2018] Maths 討論區 (2)

1001 回覆
3 Like 3 Dislike
2018-04-07 12:46:44
你地做完先
2018-04-07 22:43:28
做咗2個鐘40分鐘# ,有兩三個小分題(circle )唔識做 ,算做成點?
2018-04-07 23:48:59
我自己未做
total 20 條其實都幾多係A2 / B 既題目
所以應該都唔係容易應付

時間唔講啦, 因為其實都冇乜野好講
我而家做個solution
睇下拎到幾多分, 有冇野學到 仲好
2018-04-07 23:53:56
Let A and B be two moving points on x^(2)+y^(2)-10x-14y+65=0 . Let M be the mid-point of AB and P=(6,8). It is given that PAB is a straight line, find the equation of locus of M.

有冇巴打教下我呢題
2018-04-08 00:09:13
Let m be the slope of PAB

Equation of PAB
y-8 = m(x-6)
y = m(x-6) + 8

to find A and B:
put y = m(x-6) + 8 into x^(2)+y^(2)-10x-14y+65=0


做到呢度先
你試下繼續
2018-04-08 00:10:41
試下畫圖睇下?
2018-04-08 00:19:03
而家DSE都唔似會咁樣考
2018-04-08 00:20:26
的確係未試過出到呢種程度
2018-04-08 00:49:58
https://www.sendspace.com/file/zgsukn

頭5條先
如果你真係想參考埋個時間
我頭先5條
用左27分鐘

不過我覺我只要唔係超得太多時 以致做唔曬份卷
我已經覺得冇問題
剩返咁少時間, 你地仲有其他科
冇可能再追速度

不過第4題個bi 我都諗左陣
最後都係要畫個圖先計得掂
2018-04-08 01:00:00
Let A and B be two moving points on x^(2)+y^(2)-10x-14y+65=0 . Let M be the mid-point of AB and P=(6,8). It is given that PAB is a straight line, find the equation of locus of M.

有冇巴打教下我呢題
Let m be the slope of PAB

Equation of PAB
y-8 = m(x-6)
y = m(x-6) + 8

to find A and B:
put y = m(x-6) + 8 into x^(2)+y^(2)-10x-14y+65=0


做到呢度先
你試下繼續

有試過啊 寫咗做quadratic form 但之後都係計唔到
2018-04-08 01:17:30
試下 sum of root
2018-04-08 01:36:06
好多M1嘅學生都係咁
鳩背鳩做應付考試

有啲夾硬操完以為自己識
但讀完上到大學發現自己係零,乜柒都要追

M1個垃圾syllabus真係害咗學生一世
2018-04-08 01:39:36
其實明白 derivative 係講緊 slope 都算係掌握咗 first principle 個概念嘅
2018-04-08 01:49:39
Students’ logic:
唔考=唔使識
2018-04-08 02:28:58
sad but true

利申:支持數學科考試加入少量essay類題目
2018-04-08 03:28:57
let C be the centre
is CM perpendicular to PM?
2018-04-08 08:24:30
無窮迫近呢個concept都冇教?
2018-04-08 09:15:34
essay 題又難左d,而且唔知點出好
反而會考程度既mathematical induction應該放入core入面
2018-04-08 11:25:09
「嗱,first principles呢,喺微積分嚟講就相當重要嘅......不過考評局就規定咗M1唔會考計first principles」
「哦」(即刻低頭同fd食雞)
2018-04-08 11:26:59
2018-04-08 11:33:44
點解要食雞?
吹水台自選台熱 門最 新手機台時事台政事台World體育台娛樂台動漫台Apps台遊戲台影視台講故台健康台感情台家庭台潮流台美容台上班台財經台房屋台飲食台旅遊台學術台校園台汽車台音樂台創意台硬件台電器台攝影台玩具台寵物台軟件台活動台電訊台直播台站務台黑 洞