a, \(\left(x^2+2xy+y^2\right):\left(x+y\right)=\left(x+y\right)^2:\left(x+y\right)=x+y\)
b, \(\left(125x^3+1\right):\left(5x+1\right)=\left(5x+1\right)\left(25x^2-5x+1\right):\left(5x+1\right)=25x^2-5x+1\)
c, \(\left(x^2-2xy+y^2\right):\left(y-x\right)=\left(x-y\right)^2:\left(y-x\right)=\left(y-x\right)^2:\left(y-x\right)=y-x\)
làm giúp mik theo cột nha mn