x^2-y^2/5x^2:x^2-2xy+y^2/25x=
=(x-y)(x+y)/5x^2×25x/(x-y)^2=
=5(x+y)/x(x-y)=5(2+1)/2(2-1)=
=5×3/2×2=15/2=7,5
x^2-y^2/5x^2:x^2-2xy+y^2/25x=
=(x-y)(x+y)/5x^2×25x/(x-y)^2=
=5(x+y)/x(x-y)=5(2+1)/2(2-1)=
=5×3/2×2=15/2=7,5