2 - a=x+2

x= - a

Because the solution of the fractional equation 2/(x+2)-a/(x+2) = 1 is negative,

So-a

a & gt0

And the denominator x+2 is not equal to 0.

That is, -A+2 is not equal to 0,

A is not equal to 2,

So the range of a is: a>0 and A are not equal to 2.