题目内容
计算:53°39′24〃+26°40′38〃=__________,
180°-75°54′33〃=__________,54°20′÷6=__________
计算:53°39′24〃+26°40′38〃=__________,180°-75°54′33〃=__________,54°20′÷6=__________