计算:48°39′+67°41′=______;90°-78°19′40″=______;21°17′×5=______; &nbs...
计算:48°39′+67°41′=______;90°-78°19′40″=______;21°17′×5=______;176°52′÷3=______(精确到分)...
计算:48°39′+67°41′=______;90°-78°19′40″=______;21°17′×5=______; 176°52′÷3=______(精确到分)
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