不用計算機,,計以下各式:
tan^2 30°‧sin^2 45°/cos^2 60°
sin^2 45°-cos^2 45+sin30°‧cos60°+tan60°
收錄日期: 2021-04-13 17:25:30
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20100807000051KK01134