青海省西宁市2023-2024学年高三上学期期末联考 理科数学答案
西宁市普通高中2023—2024学年第一学期期末联考测试卷高三年级数学理科学科参考答案:1.D2.D3.A4.A5.C6.D7.B8.C9.D10.C11.C12.C13.14.15.14或2316.17.(1)由题意可得,,且,-------------1分则,所以,-------------2分所以,将点代入,可得,即,解得,且,则,----------5分所以.-----------6分(2)由(1)可得,令,,------------8分解得,,------------10分18(1)∵四边形ABCD中,,,,,M为AD的中点,且,∴四边形ABNM为正方形,且边长为1,答案第1页,共2...
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