New: enable viewer-created translations and captions on your YouTube channel!
Adding integers with different signs（正負號的整數加法）
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<div class="amara-embed" data-url="http://www.youtube.com/watch?v=NrVvu7cM8_o" data-team="null"></div>
Showing Revision 2 created 02/14/2013 by David Chiu.