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huynhbachkhoa23

(a) $$d(M,A)=d(M,B) \leftrightarrow (x_M+3)^2+36=(x_M-1)^2+4\\
\leftrightarrow x_M=-5 \to M(-5,0)$$
(b) $$d(M,A)=d(M,B) \leftrightarrow 9+(y_M-6)^2=1+(y_M-2)^2\\
\leftrightarrow y_M=5 \to M(0,5)$$
(c) $OA=3\sqrt{5}, OB=\sqrt{5}, AB=4\sqrt{2} \to P(\Delta ABC)=4\sqrt{5}+4\sqrt{2}$
 
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