Объяснение:
x²+y²-2x+6y+11=(x²-2x+1)+(y²+6y+9)+1=(x-1)²+(y+3)²+1≥0+0+1=1>0
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Объяснение:
x²+y²-2x+6y+11=(x²-2x+1)+(y²+6y+9)+1=(x-1)²+(y+3)²+1≥0+0+1=1>0