6x/(x²-y²)-3/(x+y)=6x/((x-y)(x+y))-3/(x+y)=(6x-3(x-y))/((x+y)(x-y))=(6x-3x+3y)/((x+y)(x-y))=(3x-3y)/((x+y)(x-y))=(3(x+y))/((x+y)(x-y))=3/(x-y), при х=⅓; у=-½
3/(⅓-(-½))=3/(2/6+3/6)=3/(5/6)=(3*6)/5=30/5=6
6x/(x²-y²)-3/(x+y)=6x/((x-y)(x+y))-3/(x+y)=(6x-3(x-y))/((x+y)(x-y))=(6x-3x+3y)/((x+y)(x-y))=(3x-3y)/((x+y)(x-y))=(3(x+y))/((x+y)(x-y))=3/(x-y), при х=⅓; у=-½
3/(⅓-(-½))=3/(2/6+3/6)=3/(5/6)=(3*6)/5=30/5=6