Cho tam giác ABC. Tìm quỹ tích điểm M sao cho:
a.\(\left|\overrightarrow{MA}+\overrightarrow{MB}\right|\) = \(\left|\overrightarrow{MA}-\overrightarrow{MB}\right|\)
b. \(\left|\overrightarrow{MA}+\overrightarrow{MB}+\overrightarrow{MC}\right|=\dfrac{3}{2}\left|\overrightarrow{MA}+\overrightarrow{MB}\right|\)
c. \(\left|\overrightarrow{MA}+2\overrightarrow{MB}+\overrightarrow{MC}\right|\) = \(\left|\overrightarrow{MA}+\overrightarrow{MB}-2\overrightarrow{MC}\right|\)

quãng đường AB dài 125 km

ko chắc

\(=\frac{x-z}{x}.\frac{y-x}{y}.\frac{z+y}{z}\)

\(=\frac{y}{x}.\frac{-z}{y}.\frac{x}{z}-1\)

vừa nãy mik nhầm

Bóc lịch là biết, hờ hờ

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