Answer :
This will reqiure cross multiplication. We multiply by crossing the denominators and numerators. This is the solution : -
3/x + 2/y - 4/xy
= 3y+2x/xy - 4/xy (xy is common denominator)
= 3xy + 2x - 4
xy
3/x + 2/y - 4/xy
= 3y+2x/xy - 4/xy (xy is common denominator)
= 3xy + 2x - 4
xy