Děkuji,

a když mám něco takového

tr td:nth-child(4) { display: none; }
tr td:nth-child(5) { display: none; }
tr td:nth-child(6) { display: none; }

tr td:nth-child(4) { display: show; }
tr td:nth-child(5) { display: show; }
tr td:nth-child(6) { display: show; }

tr td:nth-child(4) { display: none; }
tr td:nth-child(5) { display: none; }
tr td:nth-child(6) { display: none; }