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解几、三角、数列综合压轴(南昌二模T19)这么友好的压轴题?

2026-05-08 17:34:36

解几、三角、数列综合压轴(南昌二模T19)这么友好的压轴题?

只要想到了走角度关系

这道题就无比顺畅了

将三角函数、数列求通项与和结合的非常好的一道题

【26届南昌二模卷T19】如下：

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CONNECT:[ UseTime:0.000483s ] mysql:host=127.0.0.1;port=3306;dbname=aa460;charset=utf8mb4
SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000685s ]
SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.001126s ]
SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.003010s ]
SHOW FULL COLUMNS FROM `set` [ RunTime:0.000539s ]
SELECT * FROM `set` [ RunTime:0.001991s ]
SHOW FULL COLUMNS FROM `article` [ RunTime:0.000748s ]
SELECT * FROM `article` WHERE `id` = 506181 LIMIT 1 [ RunTime:0.001365s ]
UPDATE `article` SET `lasttime` = 1778273382 WHERE `id` = 506181 [ RunTime:0.010530s ]
SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000637s ]
SELECT * FROM `article` WHERE `id` < 506181 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.003596s ]
SELECT * FROM `article` WHERE `id` > 506181 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000483s ]
SELECT * FROM `article` WHERE `id` < 506181 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000983s ]
SELECT * FROM `article` WHERE `id` < 506181 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000973s ]
SELECT * FROM `article` WHERE `id` < 506181 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.005890s ]

0.129614s

ShowPageTrace