已知y=√x-2+√2-x+5,求2x+3y的值
已知x^2+y^2-4x-2y+5=0,求【2/3x√9x+y^2 √[x/y^2]】的值
已知√x方-y +√2x+y=0,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)
已知3x-2y/x+y=5/3求x;y的值
已知y=√(x-8)+√(8-x)+18,求代数式 (x+y)/(√x-√y)-2xy/(x√x-y√x) 的值
1.已知:x-2y=3,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]除4x 的值
已知x-2y=2016,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]除以8x的值
已知x-2y=2012,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]÷8x的值
已知x-2y=2011,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]÷4x的值.
已知X/Y=5/3,求X/(X+Y)+X/(X-Y)-Y*2/(X*2-Y*2)的值.
1.已知x,y满足√2x+y-3+|x-2y-4|=0,求x的平方-3次根号下y-5的值
已知x,y满足√(2x-3y-1)+√(x-2y+2)=0.求:2x-4分之5y的值