What is the reaction of CuSO4+H2SO4+H2O

No reaction will take place.

The ions present are:

Cu^2+
SO4 ^2-
HSO4^-
H^+
OH^-

But the number of OH^- ions is so small that you will not see any reaction.
You have so little amounts of Cu(OH)2 that we say no reaction takes place.