題目如附件,不懂為何是100-Lsin30
http://i.imgur.com/42POF0s.jpg
http://i.imgur.com/lpbFN5V.jpg
煩請各位幫忙解釋
不懂地方 謝謝
--
Sent from my Android
--
http://i.imgur.com/42POF0s.jpg
http://i.imgur.com/lpbFN5V.jpg
煩請各位幫忙解釋
不懂地方 謝謝
--
Sent from my Android
--
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