\(\frac{xy^3-x^2y}{x^2+xy}=\frac{xy\left(y^2-x\right)}{x\left(x+y\right)}=\frac{y\left(y^2-x\right)}{x+y}=\frac{y^3-xy}{x+y}\)

Với đk trên ta có:

P = \(\frac{2}{x}-\left(\frac{x^2}{x^2+xy}+\frac{y^2-x^2}{xy}-\frac{y^2}{xy+y^2}\right).\frac{x+y}{x^2+xy+y^2}\)

\(=\frac{2}{x}-\left(\frac{x}{x+y}-\frac{\left(x-y\right)\left(x+y\right)}{xy}-\frac{y}{x+y}\right).\frac{x+y}{x^2+xy+y^2}\)

\(=\frac{2}{x}-\left(\frac{x-y}{x+y}-\frac{\left(x-y\right)\left(x+y\right)}{xy}\right).\frac{x+y}{x^2+xy+y^2}\)

\(=\frac{2}{x}-\frac{x-y}{xy}.\left(xy-\left(x+y\right)^2\right).\frac{1}{x^2+xy+y^2}\)

\(=\frac{2}{x}+\frac{x-y}{xy}\)

\(=\frac{x+y}{xy}\)

\(\frac{10xy^2\left(x+y\right)}{15xy\left(x+y\right)^3}\)

\(=\frac{10xy^2\left(x+y\right)}{15xy\left(x+y\right)\left(x+y\right)^2}\)

\(=\frac{10y}{15\left(x+y\right)^2}\)

\(\frac{x^2-xy-x+y}{x^2+xy-x-y}\)

\(=\frac{\left(x^2-x\right)-\left(xy-y\right)}{\left(x^2-x\right)+\left(xy-y\right)}\)

\(=\frac{x\left(x-1\right)-y\left(x-1\right)}{x\left(x-1\right)+y\left(x-1\right)}\)

\(=\frac{\left(x-y\right)\left(x-1\right)}{\left(x+y\right)\left(x-1\right)}\)

\(=\frac{x-y}{x+y}\)

a)\(\frac{2xy}{3\left(x+y\right)^2}\)

b)=\(\frac{\left(x^2-xy\right)-\left(x-y\right)}{\left(x^2+xy\right)-\left(x+y\right)}\)=\(\frac{x\left(x-y\right)-\left(x-y\right)}{x\left(x+y\right)-\left(x+y\right)}\)

=\(\frac{\left(x-y\right)\left(x-1\right)}{\left(x+y\right)\left(x-1\right)}\)=\(\frac{\left(x-y\right)}{\left(x+y\right)}\)

câu a của công chúa xinh xắn còn thiếu nha

 = xy.(y^2+1)/xy.x = y^2+1/x

k mk nha

CÁI NÀY CŨNG KHÓ, GIÚP EM GIẢI HỘ VỚI !

\(\dfrac{x^2+3xy+2y^2}{x^3+2x^2y-xy^2-2y^3}\)

\(=\dfrac{\left(x+y\right)\left(x+2y\right)}{x\left(x^2-y^2\right)+2y\left(x^2-y^2\right)}\)

\(=\dfrac{x+y}{x^2-y^2}\)

\(=\dfrac{1}{x-y}\)

A = x-y/x.(x+y) - 3x+y/x.(x-y) . (y-x)/x+y

   = x-y/x.(x+y) + 3x+y/x.(x+y)

   = x-y+3x+y/x.(x+y)

   = 4x/x.(x+y)

    = 4/x+y

Tk mk nha

\(A=\frac{x-y}{xy+y^2}-\frac{3x+y}{x^2-xy}.\frac{y-x}{x+y}\)

    \(=\frac{x-y}{y\left(x+y\right)}-\frac{3x+y}{x\left(x-y\right)}.\frac{-\left(x-y\right)}{x+y}\)

     \(=\frac{x-y}{y\left(x+y\right)}-\frac{-\left(3x+y\right).\left(x-y\right)}{x\left(x-y\right).\left(x-y\right)}\)

      \(=\frac{x-y}{y\left(x+y\right)}-\frac{-\left(3x+y\right)}{x\left(x-y\right)}\)

       \(=\frac{x\left(x-y\right)^2}{xy\left(x+y\right)\left(x-y\right)}+\frac{y\left(3x+y\right)\left(x+y\right)}{xy\left(x+y\right)\left(x-y\right)}\)

\(=\frac{x\left(x^2-2xy+y^2\right)+y\left(3x^2+4xy+y^2\right)}{xy\left(x^2-y^2\right)}\)

  \(=\frac{x^4-2x^2y+xy^2+3x^2y+4xy^2+y^3}{xy\left(x^2-y^2\right)}\)

\(=\frac{x^4+x^2y+5xy^2+y^3}{xy\left(x^2-y^2\right)}=\frac{x^2\left(x^2+y\right)+y^2\left(5x+y\right)}{xy\left(x^2-y^2\right)}\)