<script type="text/javascript">
function mostrar(btn) {
  const div = btn.closest('div');
  var t1 = div.querySelector('[name="tx1"]').value;
  var t2 = div.querySelector('[name="tx2"]').value;
  var t3 = div.querySelector('[name="tx3"]').value;
  document.getElementById('v1').value = t1;
  document.getElementById('v2').value = t2;
  document.getElementById('v3').value = t3;
}
</script>


  <div>
    <input name="tx1" onfocus="mostrar(btn);" type="text" value="<?php echo $row_Produtos1['peso']; ?>" />
    <input name="tx2" type="text" value="1" />
    <input name="tx3" type="text" value="<?php echo $row_Produtos1['preco']; ?>" /><br />
    <input name="totaliza" type="text" id="totaliza" value="" /><br />

  </div>