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Код виджета <div class="calculator6-widget" data-source="https://www.calculator6.com/ru/qtc-calculator/" data-source-title="QTc Calculator" data-tool="https://www.calculator6.com/share/174/?l=en_US" data-width="500"><div class="calculator6-widget-title">QTc Calculator</div><div class="calculator6-widget-footer"><a href="https://www.calculator6.com/ru/qtc-calculator/">QTc Calculator</a> - <a class="calculator6-widget-link" href="https://www.calculator6.com/">calculator6.com</a></div></div><script src="https://www.calculator6.com/share-embed.js"></script>