Cho tam giác ABC . Tìm tập hợp điểm M sao cho :
a) \(MA^{\rightarrow}=MB^{\rightarrow}\)
b) \(AB^{\rightarrow}-MB^{\rightarrow}=BA^{\rightarrow}-MA^{\rightarrow}\)
c) \(\left|MA^{\rightarrow}+AB^{\rightarrow}\right|=\left|MA^{\rightarrow}-MB^{\rightarrow}\right|\)
d) \(MA^{\rightarrow}+MB^{\rightarrow}=MC^{\rightarrow}\)
e) \(\left|MA^{\rightarrow}+AB^{\rightarrow}\right|=\left|AB^{\rightarrow}+AC^{\rightarrow}\right|\)
