Mathematics
Senior High
求問這題!
4. 如右圖所示,兩射線OA與OB交於一點,試問下列選項具可食土耳
中哪些向量的終點P,會落在陰影區域內?
(A) OP=OA+20BD)
-O4+ - OB
3
3
(B) OP
=
4
(C)
4
(E) OP = 30A-1-OB
4
OP=OA-10
OB
3.
(D)OP=OA+
+ 1/3
-OB
245
(+)-BXD) A
139 4. COA
x>0
Cy<0
8
x+y=1
x>0
05
y>0
x<0
O
B
y<0----
x<0
++ y>0
803
OG (00+0
B
x+y=0 x+y=2
A+E+
OD-30G PIG TEOD
由左圖知「x > 0 且y>0」,由右圖知「x+y>1」
SOD=30G
[ x > 0
y>0 可滿足要求,選(A)(B)
x+y> EN
A0
6100-IN
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