Выражение (y/x-y + x/x+y) : (1/x^2 + 1/ y^2) - y^4/ x^2-y^2

(y/x-y + x/x+y) : (1/x^2 + 1/ y^2) - y^4/ x^2-y^2 = (y(x+y)+x(x-y)/(x-y)(x+y))/(x^2+y^2/x^2y^2)-y^4/(x-y)(x+y) = (xy+y^2+x^2-xy/(x-y)(x+y))/(x^2+y^2/x^2y^2)-y^4(x-y)(x+y) = (x^2+y^2/(x-y)(x+y))/(x^2+y^2/x^2y^2)-y^4(x-y)(x+y) = (x^2+y^2)(x^2y^2)/(x^2+y^2)(x-y)(x+y)-y^4/(x-y)(x+y) = x^2y^2/(x-y)(x+y)-y^4/(x-y)(x+y) = x^2y^2-y^4/(x-y)(x+y) = y^2(x^2-y^2)/(x-y)(x+y) = y^2(x-y)(x+y)/(x-y)(x+y) = y^2    

((х+у+х-у)/(x^2-y^2))/(x/(  x^2-y^2)) = (2x/(x^2-y^2))*  ((x^2-y^2)/x) = x

х^2-25=x^2-6x+9+2

-36=-6x

x=6

1,3% =0,013,поэтому

24860*0,013= 323,18 т получится никеля из этой руды

2405: 0,013= 185000 т руды надо переработать