ٜԉѬᅺӻ�ɓ�8.63
ܓ二
25. ڝྡהͪމΝɓٜᇞɪٙɧᓃ A�B ʿ C�߰Ҫ A�B ʿ C
ӊɓᓃٙ x Ѭᅺၾ y Ѭᅺ࿁ሜ�ʱй̙ P�Q ʿ R ɧᓃ�
(a) ίྡʕᅺ̈ᓃ P�Q ʿ R�P�Q ʿ R ݊щЗΝɓٜᇞ
ɪ�
(b) ίᓃ A�B�C�P�Q ʿ R ʕ�ϞεˇᓃЗ x ൿɪ
˙�
26. (a) ίɓٜԉѬᅺ̻ࠦɪ�ᅺ̈ɨΐᓃ�
D(-4 , 5)�E(-8 , 1)�F(-4 , -5) ʿ G(4 , 1)�
(b) ஹટ DE�EF�FG ʿ GD�
(c) (i) ᖭ̬ᗙҖ DEFG ٙՇૢ࿁ԉᇞ�̴ࡁ݊щʝ
ٜۧ�
(ii) Ӌ DEFG Շૢ࿁ԉᇞٙʹᓃٙѬᅺ�
27. H(h , 3.5) ձ K(4 , 3.5) ٜ݊ԉѬᅺ̻ࠦɪٙՇᓃ�
(a) HK ݊˥̻ᇞᒔ݊དۧᇞ�
(b) ʊٝ HK = 6 ఊЗ�Ӌ h ٙՇࡈ̙ঐ࠽�
28. ίྡʕ�OEFG ݊ɓ͍˙Җ�Ͼ OGH ݊ɓٜԉɧԉҖ�
OG = x ఊЗ�GH = (x + 1) ఊЗʿ OH = 5 ఊЗ�͍߰˙Җ
OEFG ၾ 3OGH ٙմޢΝ�Ӌ
(a) x ٙ࠽�
(b) E�F ʿ H ٙѬᅺ�
29. Ӌྡʕ̬ᗙҖ ABCD ٙࠦጐ�
C
A
B
y
x
0
5
-5 5
-5
y
x
O
E
H
F G
y
x
5
0
5
10
15
10 15
-5
-5
- 10
A
D
C
B
3
2
2
1
1
݊
5
(-4 , 1)
˥̻ᇞ
-2�10
݊
3
325 ̻˙ఊЗ
E(-3 , 0)�F(-3 , -3)�H(4 , -3)
R
Q
P