27. A(2, —8) B(—8, 2)
<img src="https://tex.z-dn.net/?f=%5Cvec%7BAB%7D%3D%20%28-8-2%29-%282-%28-8%29%29%3D%28-10%2C10%29" />
28.
X(1 1, 5) Y(3, 4)
<img src="https://tex.z-dn.net/?f=%5Cvec%7BXY%7D%3D%20%283-%28-1%29%2C4-1.5%29%3D%284%2C2.5%29" />
29.
P(—1, 2 ; 6) B(18, 7)
<img src="https://tex.z-dn.net/?f=%5Cvec%7BPB%7D%3D%20%2818-1.2%29%2C%287-6%29%3D%2816.8%2C1%29" />
30.
T(2, 3 ; —6, 5) U(— 1, —1)
<img src="https://tex.z-dn.net/?f=%5Cvec%7BTU%7D%3D%20%28-1-2.3%29-%28-1-%28-6.5%29%29%3D%28-3.3%2C5.5%29" />
31.
M(—7, O) N(5, —9)
<img src="https://tex.z-dn.net/?f=%5Cvec%7BMN%7D%3D%20%28-9-%28-7%29%2C5-0%29%3D%28-2%2C5%29" />
32.
R(0, 9) S(—15, 49)
<img src="https://tex.z-dn.net/?f=%5Cvec%7BRS%7D%3D%20%28-15-0%2C49-9%29%3D%28-15%2C40%29" />
33.
M(3A 3) O(5 ; —7, 6)
<img src="https://tex.z-dn.net/?f=%5Cvec%7BMO%7D%3D%20%285-3A%2C-7.6-3%29%3D%285-3A%2C-10.6%29" />
34.
Y(3, —4) Z(13, —29)
<img src="https://tex.z-dn.net/?f=%5Cvec%7BYZ%7D%3D%20%2813-3%2C-29-%28-4%29%29%3D%2810%2C-25%29" />
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