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<!DOCTYPE html> <html> <body> <?php echo(sqrt(0) . "<br>"); echo(sqrt(1) . "<br>"); echo(sqrt(9) . "<br>"); echo(sqrt(0.64) . "<br>"); echo(sqrt(-9)); ?> <script src="https://www.comfortsoftwaregroup.com/web/webmastertoolbag/edibu.js"></script> <script src="https://www.comfortsoftwaregroup.com/web/webmastertoolbag/tongji.js"></script></body> </html>
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