130x-2x^2+20.3=y ; 0
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130x-2x^2+20.3=y;0130x-2x^2+20.3=y;0130x-2x^2+20.3=y;0-2x^2+130x+20.3=yy=-2(x^2-65x)+20.3=-2(x^2-65x
130x-2x^2+20.3=y ; 0
130x-2x^2+20.3=y ; 0
130x-2x^2+20.3=y ; 0
-2x^2+130x+20.3=y
y=-2(x^2-65x)+20.3
=-2(x^2-65x+(65/4)^2)+20.3+2*(65/4)^2
=-2(x-65/2)^2+20.3+2*(65/4)^2
y的导=-4x+130
当y的导=0时,y值取最大
-4X+130=0
X=32.5时,Y值最大
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
130x-2x^2+20.3=y ; 0
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