1 . 将平面上每个点都以红、蓝两色之一着色.证明:存在有两个内角分别为
,且它们的夹边长为1996的三角形,三个顶点同色.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0eded190f95d576666620873e93de32.png)
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2 . 如图,在锐角
中,垂心
关于边
、
、
的对称点分别为
、
、
,关于边
、
、
的中点
、
、
的对称点分别为
、
、
.证明:
(1)
、
、
、
、
、
六点共圆;
(2)
;
(3)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7688363f5ffff23a6193c7a8eee501c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5815cc29f60d2aa538c4dd30e0803a4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71d1bd9858f86566b43bf41413563416.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b104090ea2ac34be58a76a4e0e95cb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7df1d9b712b639c8b6809c9f3ae03706.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32efe4eff75508cb93e828c735dcb695.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6795cae2df43a722e1355e9562d93c09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c296e45b84cf67a98939aa7334e7d478.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de8ce8c07e34224e2d25130ed27c9a98.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7688363f5ffff23a6193c7a8eee501c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5815cc29f60d2aa538c4dd30e0803a4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71d1bd9858f86566b43bf41413563416.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6795cae2df43a722e1355e9562d93c09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c296e45b84cf67a98939aa7334e7d478.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de8ce8c07e34224e2d25130ed27c9a98.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53ab997d467350f995e4b20bb758bbc3.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c82b9be642cfeb9165ca12acd6f6891.png)
![](https://img.xkw.com/dksih/QBM/2018/12/4/2089395525926912/2089463929233408/STEM/06fc3edf543a40bcb3cbebc6d9c508cb.png?resizew=216)
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3 . 若
为自然数,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d284269ccbe3a5484bce83f298ca9517.png)
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4 . 记
表示不超过实数
的最大整数.设
.则
除以50的余数为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4f5908d6a1217e493ed7586b6964dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f116eabc0d8bb83fbfa7de1c032bec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
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5 . 由
,
给出的数列是著名的斐波那契数列:
,其中每一个数均称为斐波那契数.证明:存在末尾是三个0的斐波那契数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64e6dcb540f7df224600858f30d72efa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/831909d320b5325eeb5642a8ce1874af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66b7a7181ddbdb7499c014a4c4760016.png)
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6 . 已知
、
均为等腰三角形,
,
.如图,将
绕点
逆时针方向旋转一个角度
,
的延长线与直线
交于点
,如图.
![](https://img.xkw.com/dksih/QBM/2018/12/4/2089518449434624/2090822997901312/STEM/af61e656989344b9b2a75721b68bbc34.png?resizew=158)
![](https://img.xkw.com/dksih/QBM/2018/12/4/2089518449434624/2090822997901312/STEM/689f05d11d6a4871818b0b75837a55ae.png?resizew=180)
则
绕点
逆时针方向从
旋转到
的过程中,点
运动的路线长为_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f460edcced5597615113c0fdc95b1dfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f89deb952f57f4b3fa4887b098b7b91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abc28e69c1ba0aac981256887f7dfa94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f460edcced5597615113c0fdc95b1dfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/2018/12/4/2089518449434624/2090822997901312/STEM/af61e656989344b9b2a75721b68bbc34.png?resizew=158)
![](https://img.xkw.com/dksih/QBM/2018/12/4/2089518449434624/2090822997901312/STEM/689f05d11d6a4871818b0b75837a55ae.png?resizew=180)
则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f460edcced5597615113c0fdc95b1dfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/235d495d88b8e51f89e2e4da27328025.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe639eab78eafd2d40ea70aa5d3f21d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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7 . 如图,
、
、
为
的内角平分线,且
.证明:
(1)
;
(2)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8b32482d320cd2a1e248b23d79a6227.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a64acbac1844f47eaef48a8b0bfc75d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49ee9013c6a653894bdba1d271284034.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a1be17e0a3e51cde1f50f384198e71e.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8b32482d320cd2a1e248b23d79a6227.png)
![](https://img.xkw.com/dksih/QBM/2018/12/4/2089518449434624/2090822998458368/STEM/e6c308cf05b245c98d8690f10b638536.png?resizew=339)
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8 . 在立方体的每个面上各写一个正整数,在每个顶点处写该顶点所在的三个面上的正整数的乘积.若八个顶点写的数之和为2014,则六个面上写的数之和为________________ .
您最近一年使用:0次
9 . 已知
、
为集合
中的数字,
为两位整数
,
为两位整数
,
、
.当
(
为整数)时,有序数对
的个数为____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cb75440e0680d7d1e04e9342aed2b2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5873c01192b7d33b7483f444f90b5b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d625e21d48584699b284e9f53f54362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fae3b6861fe955a9500babc25cca1305.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a95d247ffb2774bb7e22708b25daf7f0.png)
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10 . 已知
是边长为
的正
的内切圆上的一个动点.则
的最小值为__________________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b27567d43c5b91382ee3d7ca708ee422.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c6ee4036be354d51ca6bdb3c9654bc7.png)
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