
36 軌跡_DSE
Quiz
•
Mathematics
•
KG - University
•
Practice Problem
•
Hard
Mok Wai莫達威老師
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12 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
點 A 及點 B 的坐標分別為 (9,-2) 及 (-1,8), 求 AB 的中點
(4,3)
(5,-5)
(-5,5)
(3,4)
Answer explanation
中點即平均,相加除以2
(9,-2) 及 (-1,8)
x=(9+-1)/2=4
y=(-2+8)/2=3
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
兩直線的斜率分別為 M1 及M2
若兩直線兩直線 平行
M1 = M2
M1 X M2 = 1
M1 X M2 = -1
M1 X M2 = 0
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
兩直線的斜率分別為 M1 及M2
若兩直線兩直線 垂直
M1 = M2
M1 X M2 = 1
M1 X M2 = -1
M1 X M2 = 0
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
2x+3y-4=0 和
4x+6y-1=0 是
一對平行線
一對垂直線
一對相交但不垂直線
一對水平線
Answer explanation
x 和 y 成倍數是平行線
這題是 2 倍
2x+3y-4=0 和
4x+6y-1=0
斜率均為= -2/3
3y=-2x+4
y=-2x/3+4/3
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
2x+3y-4=0 和
6x-4y-1=0 是
一對平行線
一對垂直線
一對相交但不垂直線
一對水平線
Answer explanation
x係數相乘 加 y係數相乘=0 是垂直
2x+3y-4=0 斜率=-2/3
6x-4y-1=0 斜率=6/2
2(6)+(3)(-4)=0
(-2/3)(6/2)=-1
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
2x-3y-4=0 和
6x+ay-1=0 是
垂直, 求a
a=-6
a=6
a=4
a=-4
Answer explanation
x係數相乘 加 y係數相乘=0 是垂宜直
2x+3y-4=0 和 6x-4y-1=0
2(6)+(3)(-4)=0
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
似 DSE 2012 動點 P 與點 (3,-4) 問之距離等於2
圓
抛物線
角平分線
垂直平分線
Answer explanation
與一定點 (3,-4) 等距 2
是一圓
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