解方程3X^2-XY-4Y^2-3X+4Y=0和X^2+Y^2=25
解方程3X^2-XY-4Y^2-3X+4Y=0和X^2+Y^2=25
已知3x^2+xy-2y^2=0,求{(x+y)/(x-y)+4xy/(y^2-x^2)}/{(x+3y)*(x-y)}
实数x,y满足方程x^2-3xy+3y^2+4x-18y+52=0
已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值?
已知x,y>0 2x+y+3=xy 求5x+4y最小值
求方程组的解,方程组xy/(2x+y)-xy/(2x-y)=3,xy/(2x-y)+xy/(2x+y)=4
解方程(1)x^2+2xy+y^2-4x-4y=5,x^2-2xy+y^2-2x+2y=3 (2) xy+x+y=34,
[-(x-y)^2/xy]^-4*(y^2-xy/x)^3*(x^4/y^10)÷(xy-y^2/x)^-5=-y(y-
已知(x+2)^2+|x+y+5|=0,求3x^2y-[2x^2y-(2xy-x^2y)-4x^2]-xy
已知(x+2)^2+|x+y+5|=0,求3x^2y+{-2X^2y-[-2xy+(x^2y-4x^2)]-xy}
解方程x^2y^2-8xy+4x^2+y^2+4=0
解方程:x²+2xy+6x+2y²+4y+10=0