9. 假設a=(x,y,z1), b=(x2,y2,22))=(x3,3,23)為空間中三個非零向量,
X3
› B=Y3
Z3
X₁ Y₁ Z₁
A=
[X2 Y2 ²2]
₁) · c = 2
(2)(a + b) · c = 0
(3) a
O
(4)|a|=151
(5)| à | + | b | > | a + b |
已知AB=
2
,試選出正確的選項。
X₁X₂ + X₁ X₂ + Z₁ Z₂ = 2 = (a + c)
X2X5+X-A3+B227--2(BT)
X₁X₂ +₁/3+2₁88-V
→ a⋅c + b₁c²= 2-2=0
(X₁ + X 2 ₁ / ₁ + / 2 / ³ ₁ + 8 2 ) x C = X₁ X₂+XzXz+V₁/+Y²/3 + 2qZ₁ + ZzZz
☎ (X1,1181)=(-X2/12,-22)9) 2. 0 = 2 -> (-X2X2-+-4273, 7-22²3)=2==2=2=0
