diff --git a/frontend/lesson-editor.html b/frontend/lesson-editor.html
index c6fb6a0..920fb65 100644
--- a/frontend/lesson-editor.html
+++ b/frontend/lesson-editor.html
@@ -3110,8 +3110,8 @@
   function renderPreview() {
     const container = document.getElementById('blocks-container');
     container.innerHTML = blocks.map(b => renderPreviewBlock(b)).join('');
-    // KaTeX
-    container.querySelectorAll('.pv-formula').forEach(el => renderKatexIn(el));
+    // KaTeX (формула-блоки + формулы внутри ячеек таблиц)
+    container.querySelectorAll('.pv-formula, .pv-table').forEach(el => renderKatexIn(el));
     // Highlight.js
     if (window.hljs) {
       container.querySelectorAll('pre code').forEach(el => hljs.highlightElement(el));
@@ -3153,7 +3153,7 @@
       case 'table': {
         const rows = Array.isArray(d.rows) ? d.rows : [];
         const hasH = d.headers !== false;
-        let html = '<div class="preview-block"><table>';
+        let html = '<div class="preview-block pv-table"><table>';
         rows.forEach((r, ri) => {
           html += '<tr>';
           r.forEach(c => { const t = (ri===0&&hasH)?'th':'td'; html += `<${t}>${esc(String(c||''))}</${t}>`; });