合肥市普通高中六校联盟2024届高三第一学期期末考试数学参考答案
合肥市普通高中六校联盟2024届高三第一学期期末考试数学试卷参考答案13.【答案】14.【答案】215.【答案】16.【答案】117.(本小题10分)在中,a,b,c分别为角A,B,C的对边,且满足.(1)求角;(2)若的面积为,求的周长.解:(1)因为,所以,化简得,…………………………2分所以,………………………………………………………3分因为,所以;……………………………………………………………………………5分(2)………………………………………………………6分而由余弦定理得,即,……………………………8分题号123456789101112答案CBDBBAABBCABDABDBD则,从而...
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