已知x-2y=0,求(x/y-y/x)乘xy/x^2-2xy+y^2
已知x-3y=0,求2x+y/x-2xy+y乘(x-y)的值
已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值?
已知2x+y=0,求x-2y/x²+xy乘(x²-y²)÷x²-4xy+4y
已知3x*+xy-2y*=0,求(x/y)-(y/x)-(x*+y*)/(xy)的值.*是平方
已知3x^2+xy-2y^2=0,求{(x+y)/(x-y)+4xy/(y^2-x^2)}/{(x+3y)*(x-y)}
已知y-x-2xy=0,求3x+xy-3y/y-xy-x的值
已知y-x-2xy=0,求(3x+xy-3y)\(y-xy-x)的值
已知x-3y=0,求(2x+y)/(x^2-2xy+y^2)X(x-y)
已知x,y>0 2x+y+3=xy 求5x+4y最小值
已知x的平方=4y平方-4x+4y+5=0,求4次方-y四次方/x+2y乘x-y乘x+2y/xy的平方+y立方除x方+y
已知x+y=-1,xy=-2,求代数式-5(x+y)+(x-y)+x(xy+y)的值
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²