100÷(x+y)十64÷(x-y)=9,80÷(x+y)+80÷(x-y)=9,求x,
[x(x-y)-y(x-y)+(x+y)(x-y)]÷2x其中x=2012 y=2013
2x-y=2,求[(x²+y²)-(x-y)²+2y(x-y)]÷4y
y+z÷x=Z+X÷y=X+Y÷z,X+Y+Z不等0求X+Y-Z÷X+Y+z值
已知xy=-2,x-y=3,求(x+y)(x-y)-y^2+(x-y)^2-(6x^2y-2xy^2)÷2y
已知x、y的值满足等式(x+1)÷2=(y+3)÷4=(x+y)÷5,求式子(3x十2y十1)÷x十2y十3的值
解方程.100/(X+Y)+64/(X-Y)=9;80/(X+Y)+80/(X-Y)=9
化简:x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y)
[(-x-y)(-x+y)-(x+y)^2-x(y-y^2)}÷1/2y
已知x:y=2:3,求(x^2-y^2/xy)÷[(x+y)×(x-y/x)^3]÷(x/y^2)
已知X÷Y=2.28684,X+Y=1;求X=?Y=?
已知x-2y=2012,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]÷8x的值
①已知x:y=-2:3,求[(x^2-y^2)/xy]^2[(x+y)*(x-y)/x^3]÷x/y^2