数学01-2024届新高三开学摸底考试卷(新高考专用)(答案及评分标准)
2024届新高三开学摸底考试卷(新高考专用)01数学·参考答案123456789101112ACDADCBDBCBCBDBCD13.3614.15.16.17.(1)(2)62.【详解】(1)由正弦定理得sinsin2sincossin2sinCABAAA,所以sin2sincos2sin2sin()2sincos2cossinABACABABAB,得sin2sincosAAB,因为0πA,所以sin0A,得1cos2B,又0πB,所以π3B.(2)由1sin232△ABCSacB,得8ac,由余弦定理2221cos22acbBac,得228aca...
2025-05-09
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