JSFiddle - React, Tailwind, and code Playground

HTML

<select id="term" name="form_select">
    <option label="Срок аренды" value="0">Choose term</option>
    <option label="Месяц" value="1">Month</option>
    <option label="Неделя" value="2">Week</option>
    <option label="День" value="3">Day</option>
</select>
<select id="season" name="form_select">
    <option label="Сезон" value="0">Choose season</option>
    <option label="Низкий" value="1">Low</option>
    <option label="Высокий" value="2">Hight</option>
    <option label="Пик сезона" value="3">Peak</option>
</select>


<div id=ad_lowmonth>В месяц низкий сезонмежду<input name='ad_lowmonth_min' id='ad_lowmonth_min' value="" maxlength='20' class='inputbox' type='text' size='0' />&nbsp;и<input name='ad_lowmonth_max' id='ad_lowmonth_max' value="" maxlength='20' class='inputbox' type='text' size='0' /></div><div id=ad_lowweek>В неделю низкий сезонмежду<input name='ad_lowweek_min' id='ad_lowweek_min' value="" maxlength='20' class='inputbox' type='text' size='0' />&nbsp;и<input name='ad_lowweek_max' id='ad_lowweek_max' value="" maxlength='20' class='inputbox' type='text' size='0' /></div><div id=ad_lowday>В день низкий сезонмежду<input name='ad_lowday_min' id='ad_lowday_min' value="" maxlength='20' class='inputbox' type='text' size='0' />&nbsp;и<input name='ad_lowday_max' id='ad_lowday_max' value="" maxlength='20' class='inputbox' type='text' size='0' /></div><div id=ad_hightmonth>Цена высокий месяцмежду<input name='ad_hightmonth_min' id='ad_hightmonth_min' value="" maxlength='20' class='inputbox' type='text' size='0' />&nbsp;и<input name='ad_hightmonth_max' id='ad_hightmonth_max' value="" maxlength='20' class='inputbox' type='text' size='0' /></div><div id=ad_hightweek>Цена высокий неделямежду<input name='ad_hightweek_min' id='ad_hightweek_min' value="" maxlength='20' class='inputbox' type='text' size='0' />&nbsp;и<input name='ad_hightweek_max' id='ad_hightweek_max' value="" maxlength='20' class='inputbox' type='text' size='0' /></div><div id=ad_hightday>Цена...

CSS

div{
display:none;
}

JavaScript

$(function () {
     $('#term, #season').on('change', function () {
         $('div[id^="ad_"]:gt(8)').css("display", "none");

         var term = $.trim($('#term :selected').text().toLowerCase()),
             season = $.trim($('#season :selected').text().toLowerCase());
         if ($('#term :selected').val() > 0 && $('#season :selected').val() > 0) {
             var $sel = '#ad_' + season + term;
             $($sel).css("display", "block");

         }

     });
 });