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石家庄市25-26学年上学期高二期末考试14题解析

2026-02-05 13:26:06

石家庄市25-26学年上学期高二期末考试14题解析

石家庄市25-26学年上学期高二期末考试14题解析

焦点弦长应该有公式可套用，不过不建议学生背太多公式，所以也没有上网查！三角形周长一开始想着肯定有学生去硬算，于是我也就算了一下，发现太复杂了后来想着肯定有简单思路，心里不断念叨回归课本回归定义，还真就出来了原来是借助椭圆定义去转化！
早晨五点多起来算数学题，想了快一个小时了，看来真是老了，不服不行啊！

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CONNECT:[ UseTime:0.001064s ] mysql:host=127.0.0.1;port=3306;dbname=nowww460;charset=utf8mb4
SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001618s ]
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SELECT * FROM `set` [ RunTime:0.000565s ]
SHOW FULL COLUMNS FROM `article` [ RunTime:0.001485s ]
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UPDATE `article` SET `lasttime` = 1770293033 WHERE `id` = 471458 [ RunTime:0.004471s ]
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SELECT * FROM `article` WHERE `id` < 471458 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001461s ]
SELECT * FROM `article` WHERE `id` > 471458 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.003695s ]
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SELECT * FROM `article` WHERE `id` < 471458 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.007375s ]
SELECT * FROM `article` WHERE `id` < 471458 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003990s ]

0.165635s

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