化简求值:已知2x-y=10求[(x^2+y^2)-(x-y)^2+2y(x-y)]/4y的值
已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值?
化简求值:已知x、y满足:x^2+y^2-4x+6y+13=0 求代数式 的值.(3x+y)^2-3(3x-y)(x+y
化简求值:【(x+Y)(X-Y)-(X-Y)的平方+2Y(2-Y)】除4Y,其中X=1 Y=2
已知2x-y=10,求[(x²+y²)-(x-y)²+2y(x-y)]/4y
化简求值:[(x+y)(x-y)-(x-y)²+2y(x-y)]÷4y,其中x=二分之一,y=2
化简求值:已知x-2y=2013,求【(3x+2y)(3x-2y)-(x+2y)(5x-2y)】/4x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
化简求值:[2x的平方-(x+y)(x-y)][(-x-y)(y-x)+2y的平方],其中x=1,y=2
已知:4x^2+y^2-4x-6y+10=0,求y/x-x/y的值
已知x+y/y=11/8,求x-y/x+2y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