x2+y2+1与2(x+y-1)比大小

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x2+y2+1与2(x+y-1)比大小
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x2+y2+1与2(x+y-1)比大小
x2+y2+1与2(x+y-1)比大小

x2+y2+1与2(x+y-1)比大小
x2+y2+1>2(x+y-1)