A=x2-2x+y2-4y+6
=(x-1)2+(y-2)2+1>1
=>Min A=1<=>x-1=0 y-2=0<=>x=1 y=2
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A=x2-2x+y2-4y+6
=(x-1)2+(y-2)2+1>1
=>Min A=1<=>x-1=0 y-2=0<=>x=1 y=2