Áp dụng công thức trung điểm:
\(\left\{{}\begin{matrix}x_A+x_B=2x_M=0\\x_B+x_C=2x_N=4\\x_A+x_C=2x_P=6\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}x_A=1\\x_B=-1\\x_C=5\end{matrix}\right.\)
\(\left\{{}\begin{matrix}y_A+y_B=2y_M=4\\y_B+y_C=2y_N=2\\y_A+y_C=2y_P=6\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}y_A=4\\y_B=0\\y_C=2\end{matrix}\right.\)
Vậy \(A\left(1;4\right);B\left(-1;0\right);C\left(5;2\right)\)