Question

упростите выражение (x/y^2 - 1/x) : (1/y+ 1 /x)

Answer 1

=(х/у²-1/х)(ху/(х+у))=((х²-у²)/(ху²))*((xy)/(x+y))=(x²-y²)/(y(x+y))=((x-y)((x+y))/(y(x+y))=(x-y)/у=х/у-1 Расти большой!)