JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html>
<body>

<p>Case 1:</p>
<p id="demo1"></p>
<p id="demo2"></p>

<p>Case 2:</p>
<p id="demo3"></p>
<p id="demo4"></p>


<script>
var x = 77.8055;
document.getElementById("demo1").innerHTML ="Kết quả:&nbsp&nbsp&nbsp&nbsp"+ x;
var y = 77.8055 +0.3;
document.getElementById("demo2").innerHTML ="Javascript: "+ y;

var x = 17122656.385
document.getElementById("demo3").innerHTML ="Kết quả:&nbsp&nbsp&nbsp&nbsp"+ x;
var y = 77.8055*220070;
document.getElementById("demo4").innerHTML ="Javascript: "+ y;
</script>

</body>
</html>