Show that a is the inverse of a for the addition operation + on R and `1/a`is the inverse of `a!=0`for the multiplication operation `xx` on R.

Explanation

Here (-a)+a=a+(-a)=0
Therefore, -a is the inverse of a for '+' operation.
Similarly , for , ` a in N,(1)/(a) in N,` if ` a ne 1`
Therefore , `(1)/(a)` can not be the inverse of 'a' for `'xx'` operation in N, if `a ne 1`
Hence Proved.