已知:X-Y\X+Y=4,求X-Y\2(X+Y)-4X+4Y\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分之x+y=2,求代数式4x-2y分之x+y-4x+4y分之2x-y的值
已知(2x-y)/(x+y)=2,求代数式(4x-2y)/(x+y)-(4x+4y)/(2x-y)的值.
已知(2x-y)/(x+y)=2,求代数式(4x-2y)/(x+y)-(4x+4y)/(2x-y)的值
已知:X-Y\X+Y=4,求X-Y\2(X+Y)-4X+4Y\X-Y的值
已知2x-y/x+3y=2,求代数式4x-2y/x+3y减4x+12y/2x-y的值
已知X.x+y.y-4x+2y+5=0,求4X.X-12X Y+9Y.y的值
已知4x=9y求(1)x+y/y (2)y-x/2x
已知2x-y=10,求[(x²+y²)-(x-y)²+2y(x-y)]/4y
已知x,y满足y^4+2x^4+1=4x^2y,求x,y的值
已知4x-2y=0,求x-y/3x+2y的值
已知3x-4y/2x+y=1/2 求x/y的值