2X-2Y-X^2+2XY-1=0
X^2-2X+1-2XY+2Y=0
(X-1)^2-2Y(X-1)=0
(X-1)(X-2Y-1)=0
X=1或X-2Y=1
又有:X+Y=18/2
解方程组得:
X=1,Y=8或X=19/3,Y=8/3
所以长方形的面积=8或152/9
2X-2Y-X^2+2XY-1=0
X^2-2X+1-2XY+2Y=0
(X-1)^2-2Y(X-1)=0
(X-1)(X-2Y-1)=0
X=1或X-2Y=1
又有:X+Y=18/2
解方程组得:
X=1,Y=8或X=19/3,Y=8/3
所以长方形的面积=8或152/9