Question

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24. 如圖, AB //CD, BC = CD-DA-2, ZA = ZB = 60°,M為 BC的中點,
AB= a AD=5, * AM = x +yb, xy **,
=
9
=
=
則數對(x,y)=
=
C
T
60°
M
60X
B
a

向量

Answer 1

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