それぞれのEXEとURLを指定し、startコマンドで実行してあげればOK
echo Chromeで開く start "" "C:\Program Files (x86)\Google\Chrome\Application\chrome.exe" https://www.google.com/ echo Edgeで開く start "" "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" https://www.google.com/ echo Internet Explorerで開く start "" "C:\Program Files\Internet Explorer\iexplore.exe" https://www.google.com/