一道数学化简题,若x-y\x+y=1\2,求x-y\x+y-2(x+y)\x-y的值(注:不会打分数,\左边是分子,\右
若|x+y-1|+(x-y-2)²=0,求代数式(x+2y)(x-2y)-(2x-y)(-y-2x)的值.
若x-y=1,求代数式x(x-y)+y(y-x)+2013的值
已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值?
1、x(x-y)(x+y)-x(x+y)^2
若x、y满足2x+y=6,x-3y=1,求7y(x-3y)²-2(3y-x)³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x-y/x+y=5,求x-y/2x+2y+5x+5y/3x-3y的值
当x+y/x-y=1/2时,求代数式x-y/x+y-2x+2y/x-y的值
已知:x+2y=2011 求代数式{(x^+y^)-(x-y)^+2x(x+y)}/2x的值
已知x+y/y=11/8,求x-y/x+2y的值.
若x=-1/4,能否确定代数式(2x-y)(2x+y)+(2x-y)(y-4x)+2y(y-3x)的值?