来自李寿涛的问题
SOS,比较大小,x×x+y×y+1与2(x+y-1),-
SOS,
比较大小,x×x+y×y+1与2(x+y-1),-
1回答
2020-04-16 18:41
SOS,比较大小,x×x+y×y+1与2(x+y-1),-
SOS,
比较大小,x×x+y×y+1与2(x+y-1),-
x2+y2+1-2(x+y-1)=x2+y2+1-2x-2y+2=(x-1)2+(y-1)2+1
因为(x-1)2+(y-1)2>=0所以(x-1)2+(y-1)2+1>0
x,y后的2是平方.