actually for q27 your method really slow lor, given that statement 1 is correct, and C1 and C2 is not a point circle statement 3 must be correct, just imagine it in your mind the locus drawn must cut C2 in two different point
@@punchingkwan3052 當C2係一個fixed circle, 然後 centre of C1 lies on C2,其實喺唔知radius嘅情況下，C1 係可以係一個好大嘅circle，令到佢地冇交點，如果要cut two distinct point,個condition 就要fulfill到0
Q27 C1: x^2+y^2+2x+4y-149/2=0 C2: x^2+y^2-8x-20y-53=0 For any circle x^2+y^2+Dx+Ey+F=0 Centre (-D/2,-E/2) Radius sqrt((D/2)^2+(E/2)^2-F) Therefore centre of C1 =(-1,-2) Put centre into C2 LHS=RHS I is correct Radius of C1 not equal to radius of C2 (use formula above) II incorrect For III Solve C1 and C2 x^2+y^2+2x+4y-149/2=0 … (i) x^2+y^2-8x-20y-53=0 …(ii) (i) - (ii) 10x +24y = 43/2 Express x in terms of y and substitute into either (i) or (ii) Discriminant of quadratic >0 therefore two distinct intersections
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Q8
呢類題目基本上佢年年都出，個重點係搵曬兩條線嘅slope, x-intercept同y-intercept in terms of a,b,c 再進行大細比較，要remind嘅係有時個inequality個分母有unknown就要知道埋個unknown係正定負，先決定到個符號使唔使調轉
Q14
要maximize個area，其實只要maximize所有邊長就得，相反，minimize都係一樣道理(不過注意，有D題目唔會咁simple，有時你maximize 某D邊長，反而會整細個area)
Q27
注意apply formula要make sure x^2同y^2 個coefficient係1，所以喺計之前要將C1全式除2，然後再用formula計個centre同radius
I. 揾完C1 centre再代落C2條式，睇下係咪0
ll. 揾完radius就會知道
lll. 呢度有兩個methods
method 1:兩項兩unknown,solve △(慢嘅方法)
method 2: 揾distance between two centre,再揾R1+R2同R1-R2個magnitude，如果IR1-R2I
actually for q27 your method really slow lor, given that statement 1 is correct, and C1 and C2 is not a point circle statement 3 must be correct, just imagine it in your mind the locus drawn must cut C2 in two different point
@@punchingkwan3052 當C2係一個fixed circle, 然後 centre of C1 lies on C2,其實喺唔知radius嘅情況下，C1 係可以係一個好大嘅circle，令到佢地冇交點，如果要cut two distinct point,個condition 就要fulfill到0
唔識真係要撞下 起馬填個答案落去~
現代既同學仔不容易呀✨dse加油❤️💪🏻
Q27 C1: x^2+y^2+2x+4y-149/2=0
C2: x^2+y^2-8x-20y-53=0
For any circle x^2+y^2+Dx+Ey+F=0
Centre (-D/2,-E/2)
Radius sqrt((D/2)^2+(E/2)^2-F)
Therefore centre of C1 =(-1,-2)
Put centre into C2
LHS=RHS
I is correct
Radius of C1 not equal to radius of C2 (use formula above)
II incorrect
For III
Solve C1 and C2
x^2+y^2+2x+4y-149/2=0 … (i)
x^2+y^2-8x-20y-53=0 …(ii)
(i) - (ii)
10x +24y = 43/2
Express x in terms of y and substitute into either (i) or (ii)
Discriminant of quadratic >0 therefore two distinct intersections
數學呢啲嘢真係🥱畢咗業之後 誓死唔掂呢😂實在太難呢 簡直惡夢😂🥲
份卷45題
答案分佈一定係平均嘅（11、11、11、12）
唔識嘅題目飛咗去先
做晒後數吓自己各選項有幾多個
然後全部撞你之前答得最少嗰個選項
例如你而家有10個A、8個B、12個C、7個D，咁就全部撞晒D
或者你貪心嘅就撞到其中一個選項12個，其餘11個
唔係唔識就撞C！😂😂😂
Btw呢個方法只適用於數學科，祝各位考生好運！
前提係自己答咗嗰啲確定係啱嘅答案
同埋phy paper 1A好似都係平均分佈 嗰時操卷特登數咗幾年都係8,8,8,9 不過唔肯定有冇記錯
各位考生加油努力溫書頂硬上！
想Pin咗你去 :P
我想睇你哋做chem嗰份
幾時試中文（好想睇😂😂）
等佢出左新一年 就玩下😂😂
@@a.antoniaw 期待你嘅挑戰😆
謝謝分享
今年dser 😭mc 做pp都覺得後面10幾題填六合彩咁。。同埋見上年全部科cut off太恐怖
加油阿 ~ 考之前早啲訓 ~~ 到時頭腦清楚啲會好啲~~
@@a.antoniaw Thx🙈一定考好晒去~btw Anton 靚咗👍🏻
下個禮拜就考chem啦😱
加油呀 :P
我當年數學如果阿tim幫我補習，我一定拎四😂
幫你同佢講xd
有冇人14題係用排除法？😂
啱ar 就算唔識都要用機率去撞 ABCD機率差唔多 睇吓邊個無圈咁多就揀佢
甜冬
咁樣幫人補數......
有咩問題😂
真係好難 上年考5* 再睇返你做果幾題 完全唔識...
兩個一齊撞啱嗰下好笑🤣
印象中，Anton 個妹maths 好似幾叻
First🔥✨
個人覺得,2018 年maths 最難
感覺上2018年 有些題是最難或最花時間, 但整體上還是2020比較難?
2018有4-5題比較難，2020係整體mc都難
Math 好易啫
試吓中文
中文好難wor😂
@@a.antoniaw 🤣🤣🤣
做數學mc技巧要識跳題做，尤其Q17,18，基本年年呢幾題都好花時間，1h15min做唔哂係正常
係阿 哩幾題圖形題要睇好耐~
唔識就答C😂
點解唔叫埋阿翔同Anthony一齊做🙄
因為拍果陣是凌晨 Anthony一早已歸家 呀翔睇緊啲片sosad
見到數學卷就....😿只知道感覺失了蹤～不知道我是這麼蠢💩～
惡夢Das
我係2020 DSEr 攞到5**過咗一年返黎睇都唔識起碼一半....
所以係唔係考試mode都好緊要😂
數學MC真係....考到🤮🤮🤮
5*都叫學霸....你叫我maths m2 5** 點叫自己好
你呢啲叫自大
@@srgrjgrg1869 你指佢啊 5*都夠膽tag自己做學霸唔係自大係乜野