已知|5x-y-8|+(7y-x+2)=0则4x+6y
已知x*x+4x+y*y-2y+5=0,则x*x+y*y=?
已知(x-1)2+4|y-6|=0,则5x+6y-4x+8y=?
已知x.x+y.y+8x+6y+25=0,求代数式(x.x-4y.y)/(x.x+4xy+4y.y)-x/(x+2y)的
已知x²+4x+y²-2y+5=0,则x+y=
x^8-x^7y+x^6y^2-x^5y^3+x^4y^4-x^3y^5+x^2y^-xy^7+y^8
若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7
已知x.x+y.y-6x-8y+25=0,求3x.x+5y的值
y-3x=2,y-5x=4,y-7x=6,y-9x=8,y-11x=0方程组,
已知x^2+4y^2-4x+4y+5=0,求(y^4-x^4)/(y-2x)(x+y)*2x-y
已知x的平方+y的平方-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
已知实数x.y满足根号(x+y-8)+根号(8-x-y)=根号(3x-y-4)+根号(x-2y+7),求x,y