由x^2+9y^2-2x+24y+17=0得
x^2-2x+1+9y^2+24y+16=0
即 (x-1)^2+(3y+4)^2=0
(3y+4)^2=0
y=-4/3
所以
y^2=(-4/3)^2
=16/9
y^-2=(-4/3)^-2
=9/16
由x的二次方+9y的二次方-2x+12y-5=0得
x^2-2x+1+9y^2+12y+4=0
即(x-1)^2+(3y+2)^2=0
(x-1)^2=0
(3y+2)^2=0
x=1
y=-2/3
所以
X的值是1
X-(Y的2次方)
=1-(-2/3)^2
=5/9
若a^2+b^2-4b+2a+5=0,求b^a的值
由a^2+b^2-4b+2a+5=0得
(a+1)^2+(b-2)^2=0
即
a=-1
b=2
所以
b^a=2^-1
=1/2