x^2+y^2=x+y
(x^2-x+1/4)+(y^2-y+1/4)=1/2
(x-1/2)^2+(y-1/2)^2=1/2
所以曲线表示一个圆,半径是根号(1/2)
那么面积是:Пr^2=П*(√(1/2))^2=П/2
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