All of them is a part of Plesk PHP package:
[root@ppu17-0 ~]# rpm -qa | grep bcmath
plesk-php53-bcmath-5.3.29-centos7.15102117.x86_64
plesk-php55-bcmath-5.5.38-centos7.16072212.x86_64
plesk-php56-bcmath-5.6.27-centos7.16101710.x86_64
plesk-php70-bcmath-7.0.12-centos7.16101411.x86_64
plesk-php52-bcmath-5.2.17-centos7.15100614.x86_64
plesk-php54-bcmath-5.4.45-centos7.16032517.x86_64
[root@ppu17-0 ~]# rpm -qa | grep opcache
plesk-php55-opcache-5.5.38-centos7.16072212.x86_64
plesk-php56-opcache-5.6.27-centos7.16101710.x86_64
plesk-php70-opcache-7.0.12-centos7.16101411.x86_64
[root@ppu17-0 ~]# rpm -qa | grep soap
plesk-php53-soap-5.3.29-centos7.15102117.x86_64
plesk-php70-soap-7.0.12-centos7.16101411.x86_64
plesk-php55-soap-5.5.38-centos7.16072212.x86_64
plesk-php54-soap-5.4.45-centos7.16032517.x86_64
plesk-php56-soap-5.6.27-centos7.16101710.x86_64
plesk-php52-soap-5.2.17-centos7.15100614.x86_64
So, when you install PHP5.6, for example, in Plesk installer, all these related packages will be installed for PHP5.6.