求5x-2y=x-y=4x-3y-2的解
求5x-2y=x-y=4x-3y-2的解
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-(
1.已知:x-2y=3,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]除4x 的值
已知x-2y=2011,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]÷4x的值.
已知2x-y/x+3y=2,求代数式4x-2y/x+3y减4x+12y/2x-y的值
若x-y/x+y=5,求x-y/2x+2y+5x+5y/3x-3y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X-Y/X+Y=3,求代数式2(x-y)/X+Y-3X+Y/X+Y
先化简再求值(x-y)(x+y)-(x-2y) 的完全平方+x(3x-5y)-(x-y)(x-2y),其中x=1/2 y
已知x^3+xy^2+x+x^2y+y^3+y=0,求5x-6y/3x+4y的值.