$cos72= \dfrac{3- \sqrt{5} }{2( \sqrt{5} -1}$ chua biet cach go cong thuc mong moi nguoi thong cam
Edited by tuan101293, 19-11-2009 - 22:38.
Edited by tuan101293, 19-11-2009 - 22:38.
Bài này có trong sbt lớp 10 màchung minh:
cos72= :frac{3- :sqrt{5} }{2( :sqrt{5} -1} chua biet cach go cong thuc mong moi nguoi thong cam
KT-PT
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