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Why my jquery isn't displayed by browser?

so i am new to jq and i am trying to run this code but the browser doesn't show anything, tried to link the script library before ending tag of body. Thanks!

<!DOCTYPE html>
<html>
enter code here
<head>
    <meta charset="utf-8">
    <title>Data Types</title>
    <script src="jq/jquery-3.2.1.min.js"></script>
</head>

<body>
    <script>
    document.write(3.25 + 1000);
    document.write('<br>' + 5 - 1000);

    var1 = "Buna";
    var2 = "Ziua";
    document.write("<br>Concatenare siruri:" + var1 + var2 + '<br>');

    a = true;
    document.write(a);
    var = fructe['mere', 'pere', 'caise'];
    document.write('<br>' + fructe[1]);
    </script>
</body>

</html>

You should fix this line:

var = fructe['mere', 'pere', 'caise'];

To

var fructe = ['mere', 'pere', 'caise'];

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