Yes, if you are the only user of those computers. If you have multiple computers used by more than one person, you can purchase a Family Pack license, which covers 5 computers in the same household.
For more information on the Family Pack Software License :
The Family Pack Software License Agreement allows you to install and use one copy of the software on each computer located in the same household and used by persons who occupy that household. By “household” we mean persons who share the same housing unit such as a house or an apartment, including student members who are primary residents of that household but reside at a separate on-campus location. The Family Pack License Agreement covers home offices and home-based businesses. This license does not extend to other business or commercial users.