河南省实验中学2023-2024学年高三上学期期中考试 数学答案
参考答案:1.C2.D3.B4.C5.D6.B7.C8.A9.ABD10.ACD11.ACD12.BC13.9614.15.16.17.(1)(2)【详解】(1)在中,因为,故由可得由正弦定理得,即.则,又,故.(2),得,由余弦定理,即,得,所以的周长为18.(1)当时,;当时,;所以(或)(2)时,;时,,不符合上式;所以,设的前n项和为,则.{#{QQABYYgEogiAQBBAAQgCQw1SCAKQkACCAAoORBAAIAABAAFABAA=}#}150423①②④π3B=213+ABC()()sinsinπsinABCC+=−=()()()()sinsinsinacABabAB...
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