The Logicom TAB752 is quite "hard" to root, as it is not pre-rooted and not supported or even recognized by most software.
As said in other posts you need "USB debugging" enabled and "ADB drivers" installed together with adb software.
(A good distribution of ADB software and drivers comes with the "CyanogenMod" software)
After failures in getting root access with many popular methods I have been finally able to install the "su" command by using the "Cydia Impactor" (search on Google). It seems this software is able to get superuser acces on most of the "chinese" and ultra-low cost stuff now on the market.
After that, you can follow one of the tutors from this or other forums.
In very brief summary, opening a DOS shell in the folder where ADB is installed:
- adb shell
- mount -o remount,rw /system
- busybox cp "filetobecopied.apk" /system/app/
- chmod 644 /system/app/"filetobecopied.apk"
- chown root.root /system/app/"filetobecopied.apk"
where "filetobecopied.apk" is this list of apps (get them from gapps, with the version suitable for your Android release):
Ciao and good luck!