2023年普通高等学校招生全国统一考试考前演练三3(全国卷)理科数学试题答案

2023年普通高等学校招生全国统一考试考前演练三3(全国卷)理科数学试题答案，目前我们已经整理了2023年普通高等学校招生全国统一考试考前演练三3(全国卷)理科数学试题答案的各科答案和试卷，更多试卷答案请关注本答案网。

第二节：书面表达Last Fridaymyclass wentto the nearbycommunity to take part in some voluntary work,whichlasted from 9:00 am to 4:00 pm.There were various forms of voluntary workincluding picking up the rubbish,providing computertechnical support and so on.We were divided into fivegroups.The task of my group was to help the elderlyclean their windows.Besides,we also helped thechildren in the neighbourhood with their lessons.By participating in such meaningful social activities,not only are my interpersonal skills improved but also Ilearn to bring my love to the people in need.

14.2√3【解析】因为AD⊥AC,所以cosC=sin∠ADC,又∠ADC+∠ADB=π，所以sin∠ADB=sin∠ADC,即cosC=sin∠ADB,在△ABD中，由正弦定理得AB-ADsinADBAD3sin B-/3AD-23.sin Bsin B