You have to simplify each expression:
1/R+1/T
multiply the first term by t/t, and the second R/R
You should then get...
(T+R)/RT
To simplify the expression 1/R + 1/T, you can find a common denominator by multiplying the first term by T/T and the second term by R/R. This gives you (T/RT) + (R/RT).
Now, since both terms have the same denominator (RT), you can combine them by adding the numerators. This results in (T+R)/RT.
So, the simplified expression is (T+R)/RT.