若x^2-y^2=30,x+y=6/5,求x-y的值
若x-y/x+y=5,求x-y/2x+2y+5x+5y/3x-3y的值
(1)已知x+y=6,x²-y²=5,求x-y的值(2)若x+y=3,x²+y²
若x、y满足2x+y=6,x-3y=1,求7y(x-3y)²-2(3y-x)³的值
若|x+y-1|+(x-y-2)²=0,求代数式(x+2y)(x-2y)-(2x-y)(-y-2x)的值.
当2x-y/x+y=3时,求代数式2x-y/2x+2y+x+y/6x-3y的值.
如果x,y表示有理数,且x、y满足条件,|x|=5,|y|=2.|x-y|=y-x,求:x+2y的值.
已知X.x+y.y-4x+2y+5=0,求4X.X-12X Y+9Y.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2/x+2/y=根号24,求 x/y(x-y) - y/x(x-y)的值
已知2/x 2/y=根号24,求 x/y(x-y) - y/x(x-y)的值
若|5x-2y-3|+(x+6y-11)X(x+6y-11)=0成立,求x,y的值,
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)