2.20 root plus 5 root /5 root minus 2.

3. (3 under radical sign+2 under radical sign) * (3 under radical sign-2 under radical sign)

4. Root number 1/7+ root number 28- root number 700

5.2 times the number of radicals 5 (30+05-1/2 under the number of radicals 65438)+2/3-2 under the number of radicals/5 under the number of radicals.