А(2;3), С(2;1), В(х;у)
(х+2)/2=2; х+2=4; х=2
(у+3)/2=1; у+3=2; у=-1
В(2;-1)
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А(2;3), С(2;1), В(х;у)
(х+2)/2=2; х+2=4; х=2
(у+3)/2=1; у+3=2; у=-1
В(2;-1)