Thank you Gerardo for hour quick reply. O understand what you mean but the price of datacenter edition is ten times. This reseller told me I can buy two licenses and install them in a single server to have double services about Windows server standard such as the VMs (4 in this case) How can I do this configuration?
A Standard edition license will cover licensing for the Hyper-V host and two VMs (essentially using the same key for all three installs)
But, installing Standard edition as you Hyper-V host and enabling the Hyper-V role willlimit you to creating only 2 VMs
Adding another license key will do nothing.
If you can't afford licenses for Datacenter, the next best option would be to install Hyper-V Server 2016 as your host machine (this is free by the way), then you can create as many VMs as you like, but you will need to license all operating systems within the VMs.