8.56 ୋ 8
課文摘要ࠠ ᓃ Է ɿ
1. ٜԉѬᅺӻ
ίٜԉѬᅺ̻ࠦɪ�߰ (a , b) ݊ P ٙѬᅺ�
ۆ a ၈މ P ٙ x Ѭᅺ�Ͼ b ၈މ P ٙ y Ѭᅺ�
ᓃ Ѭᅺ
x
y
-1
-2
-3
-4
3
4
2
10 1 2 3 4
-1-2-3 5
B
C
A
D
y 軸
x 軸
原點 O
O (0 , 0)
A (5 , -2)
B (-3 , 4)
C (2 , 0)
D (0 , -4)
2. Շᓃʘගٙ൷ᕎ
(a) ࿁ίΝɓ˥̻ᇞɪٙᓃ�̴ࡁϞΝ
ٙ y Ѭᅺ�
࿁ίΝɓདۧᇞɪٙᓃ�̴ࡁϞΝ
ٙ x Ѭᅺ�
(b) ࿁ P(p , y) ձ Q(q , y) ˲ p 2 q�
PQ = p - q�
࿁ R(x , r) ձ S(x , s) ˲ r 2 s�
RS = r - s�
x
y
B (2 ,-5)
D (-4,-1)
C (2 ,-1)
O
DC = [2 - (-4)] ఊЗ = 6 ఊЗ
CB = [(-1) - (-5)] ఊЗ = 4 ఊЗ
3. εᗙҖٙࠦጐ
(a) Ҭ̈ቇٙ˥̻ᇞݬאདۧᇞݬٙڗ
ܓ�ϾӋ̈εᗙҖٙࠦጐ�
(b) ɓԬྡҖٙࠦጐ̙л͜ʱ௲جא෬ج
Ӌ�
ڗ˙Җ CDEF ٙࠦጐ
= CD # CF
= (6 - 2) # (4 - 1) ̻˙ఊЗ
= 12 ̻˙ఊЗ
4. ᓃٙᜊ౬
(a) ᓃ P(x , y) ̻ٙ
̻ n ఊЗ ᅂ྅ٙѬᅺ
Σ̛ (x + n , y)
Σ̸ (x - n , y)
Σɪ (x , y + n)
Σɨ (x , y - n)
x
y
B (8 ,4 )
C(8,-2)
A(3,4)
O
5 單位
6 單位
A(3 , 4) Σ̛̻ 5 ఊЗЇ B ᓃ�B ᓃΣɨ̻
6 ఊЗЇ C ᓃ�ۆ
B ٙѬᅺ = (3 + 5 , 4) = (8 , 4)
C ٙѬᅺ = (8 , 4 - 6) = (8 , -2)
x
y F (2 ,4 ) E (6 ,4 )
C (2 ,1 ) D (6 ,1 )
O 習錦囊
• 䙺୦ᎀᚾᅂ˪
• ਗ࿒ሙ˖ࠅ
• ʮόڌ