<script><!--letは変数を作る時に、aやbは変数の名前>
let a = 10;
let b = 20;
let c = "あいう"
console.log(a+b);
console.log("a+b");
console.log(a+b+c);
</script>
<script><!--letは変数を作る時に、aやbは変数の名前>
let a = 10;
let b = 20;
let c = "あいう"
console.log(a+b);
console.log("a+b");
console.log(a+b+c);
</script>