已知2y-3x+3=0 求(2y-3x)^3x-2y+3(3x-2y)-18÷(2y-3x)
已知X-Y/X+Y=3,求代数式2(x-y)/X+Y-3X+Y/X+Y
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
已知x-3y=0,求(2x+y)/(x^2-2xy+y^2)X(x-y)
已知xy=-2,x-y=3,求(x+y)(x-y)-y^2+(x-y)^2-(6x^2y-2xy^2)÷2y
已知3x^2+xy-2y^2=0,求{(x+y)/(x-y)+4xy/(y^2-x^2)}/{(x+3y)*(x-y)}
已知 2x-3y/y等于2 求x-y/2x 求x-3y/2x+y
已知2y-3x+3=0 求(2y-3x)^3x-2y+3(3x-2y)-18÷(2y-3x)
已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-(
已知:3x=8y.求(1)x+y/y (2)2x+3y/x-2y
已知|2x-3y|+|3x-y-1|=0,求x,y的值.
已知2x+3y=2(x>0,y>0),求x+y最大值
已知4x-2y=0,求x-y/3x+2y的值