黑龙江省鹤岗市第一中学2022-2023学年高三上学期开学考试数学答案
数学参考答案1.A2.D3.D4.A5.C6.C7.D8.B9.AB10.ABCD11.ABD12.BCD13.14.015.16.17.(1)所以最小正周期,(2)(-1,2](3)∵,∴∵∴,∴.18(Ⅰ)由得,当时,下载最新免费模拟卷,到公众号:一枚试卷君两式作差得:,即,即,令得,所以是以为首项,为公比的等比数列.所以,故.(Ⅱ)由(Ⅰ)知,两式作差得:所以.19.(1),由,可得,所以,经检验,满足题意.(2)因为在上单调递增,所以在上恒成立,即在上恒成立.令,,则,因为,所以,所以,所以.所以实数a的取值范围为.20(1)由题意知,,得周期,∴当时,取得最大值4,即,得,得,又,当...
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