X2+Y2-4X-6Y+13=0
X2-4X+4+Y2-6Y+9=0
(X2-4X+4)+(Y2-6Y+9)=0
(x-2)2 + (y-3)2=0
所以,x-2=0 x=2
y-3=0 y=3
【(-y/x3)3】/【(-1/xy)4】/【(x/y2)2】
=(-y3x-9)/(x-4y-4)/(x2y-4)
=(-y3-(-4)x-9-(-4))/(x2y-4)
=(-y7x-5)/(x2y-4)
=-y7-(-4)x-5-2
=-y11x-7
=-3112-7
=-311/27
1年前
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