x²-4x+y²+6y+13=0.x=?y=?
x²-4x+y²+6y+13=0.x=?y=?
已知x,y满足x²+y²-4x+6y+13=0则(3x+y)²-(3x+y)(3x-y)的
已知x²+4y²-6x+8y+13=0,求x-y/x+y的值.
已知x²+y²+13-4x+6y=0,求(2x-y)²-2(2x-y)(x+2y)+(x+
x²-4x+y²+6y+13=0,x-y=?
已知实数x、y满足x²+y²+4x-6y+13=0
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
已知x、y是实数,且x²+y²-4x-6y+12=0.求x²+y²的最值,x-y
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²
已知x²+y²+5=2x+4y,求【2x²-(x-y)(x-y)】【(x+y-1)(x-y
已知,x²+y²+4x-6y+13=0.x,y均为实数,求x^y的值
已知x²+4x+y²+6y+13=0,求x-y+(2y²/x+y) 请在10;20分前回答