名校
1 . (1)判断并证明集合
和集合
之间的关系;
(2)判断并证明
是
的什么条件.(“充分非必要、必要非充分、充要、既非充分又非必要”中选择)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/092cc2154c7145667f6f4b59442b94d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce8f18aaf85c45e75e713aaf8ee96f68.png)
(2)判断并证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1040c79a8b3bc0b9edd718b41a2512c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95c82faf1f70c84931e62756b9cd73b8.png)
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名校
2 . 在研究函数过程中,经常会週到一类形如
为实常数且
的函数,我们称为一次型分式函数.请根据条件完成下列问题.
(1)设
是实数,函数
,请根据
的不同取值,讨论函数
的奇偶性,并说明理由;
(2)设
是实数,函数
.若
成立的一个充分非必要条件是
,求
的取值范围;
(3)设
是实数,函数
,若存在区间
,使得
,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9796db5f297d4023eac8d1aa4739c99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b744e7cd7496125a9bcd6b756d09ebff.png)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa1944af8ede16275cdcbe721a81870d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8aade587301e484fe76bdf87e6d5b03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0527a896aec4a245945e5edee00deed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d47f8d234c1df11e957b9bd7d3f2da47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fe2a076aa933bf55763c67b8734b1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af24aeacd2576456cc192826ecd5b107.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fcc3c97c6d73f7ef44b90ec6f3065ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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3 . 高一的珍珍阅读课外书籍时,发现笛卡尔积是代数和图论中一个很重要的课题.对于非空数集A,B,定义
且
,将
称为“A与B的笛卡尔积”
(1)若
,
,求
和
;
(2)试证明:“
”是“
”的充要条件;
(3)若集合
是有限集,将集合
的元素个数记为
.已知
,且存在实数
满足
对任意
恒成立.求
的取值范围,并指明当
取到最值时
和
满足的关系式及
应满足的条件.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e83ae6d18a3a3f1383a2c857ed0054a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbf8be42fdd0b30c8a100c4110d434ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81e37e656d05244fe3a5769cd1446725.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfc03ec3d78487844b44cd273efc9188.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f808f81b6ea9da53d51c549be04f4267.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81e37e656d05244fe3a5769cd1446725.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1a1ea7aabd373ab4e84031b84936e70.png)
(2)试证明:“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14ec4a0fcae6ea3ad50754038379bf52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c98816a922b6dd4704b3f95adc77cb7b.png)
(3)若集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ec8996421ea2bdb85b9f29c714d6a8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34bcce23cde0e66aa6b2877cb49541d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aed82f14b30abdb31af23beb3a6af8a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f29c06a3e9a73e905eb87d71efa201c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/223df28e586d0f67cdb8b675cec0a59a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7ac94bced60536f5595d1ffecf875ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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4 . 已知集合
,对于集合
的非空子集
.若
中存在三个互不相同的元素
,
,
,使得
,
,
均属于
,则称集合
是集合
的“期待子集”.
(1)试判断集合
,
是否为集合
的“期待子集”;(直接写出答案,不必说明理由)
(2)如果一个集合中含有三个元素
,
,
,同时满足①
,②
,③
为偶数.那么称该集合具有性质
.对于集合
的非空子集
,证明:集合
是集合
的“期待子集”的充要条件是集合
具有性质
;
(3)若
的任意含有
个元素的子集都是集合
的“期待子集”,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5a32bb35170ebe4aba4d96ad30fcfe0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20d6fc9b90f370fbb27552876b650f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/980ab4deb9e7f2bc9288787f5243a4d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d1176ec378d071e8972ffaa3f944952.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(1)试判断集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca1c611cfb42aba676bc20f876f8f14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/570507469628d759e4ebf323fadf79c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f30f56664446f32dbbc2c5f12a99374.png)
(2)如果一个集合中含有三个元素
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d561cdf17d3a6d7d57af719cb6100c85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e55de080a3c1313bbd6ea5c17307c723.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1433c8103033c67232f2f9ae189608d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18392c5a07408fd70ddee8a30f705305.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
您最近一年使用:0次
2023-03-21更新
|
1040次组卷
|
6卷引用:第一章 集合与逻辑(压轴题专练)-速记·巧练(沪教版2020必修第一册)
(已下线)第一章 集合与逻辑(压轴题专练)-速记·巧练(沪教版2020必修第一册)北京市丰台区2023届高三一模数学试题专题12压轴题汇总(10、15、21题)专题01集合与常用逻辑(已下线)北京市丰台区2023届高三下学期3月一模数学试题变式题16-21北京卷专题02集合(解答题)
名校
解题方法
5 . 集合
{
为严格增函数}.![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddd9d037c0d8e896aadf54a606216ed1.png)
(1)直接写出
是否属于集合![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fb3ca04b6d34b11e4484c9537ad9a83.png)
(2)若
.解不等式:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10777a53e99afc4cf30f6e1d5b0a3d12.png)
(3)
证明:“
”的充要条件是“
”
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/447a9718a502491b47072ce013c26a2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/007dfaabad7788745505ac6363878bf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddd9d037c0d8e896aadf54a606216ed1.png)
(1)直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2747dd40e29f1e55ad2c611e70a26130.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fb3ca04b6d34b11e4484c9537ad9a83.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eac4f25a9e721472d77ad3b53e379866.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10777a53e99afc4cf30f6e1d5b0a3d12.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d00953787b22838f02eeaf5e485def38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56762c325380f8adf5c6021d9aaf386e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7be45461ead6234f68604da537c594d3.png)
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解题方法
6 . 已知
是定义在
上的函数,对于
上任意给定的两个自变量的值
,当
时,如果总有
,就称函数
为“可逆函数”.
(1)判断函数
是否为“可逆函数”,并说明理由;
(2)已知函数
在区间
上是增函数,证明:
是“可逆函数”;
(3)证明:函数
是“可逆函数”的充要条件为“
”.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ce7ae90d808f05e86ea063238e4b2f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33bd24e647a626899a243a3f3984f90a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f27822887caad20f3a075ca2fb74155c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
(1)判断函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e2fcd758d9003da00a5d89ee944ced3.png)
(2)已知函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca6b4195d2a7113b9707daa75a3c1cd5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d562dc22dfb3b81d0c3f88b54d063c2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66e1ff9996cb6646eab2ba69946d1cf7.png)
(3)证明:函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50aaf7234645fe25d1160bc0173e4d47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b4d795709b0abcf47bceec2250f2f9b.png)
您最近一年使用:0次
2023-01-12更新
|
248次组卷
|
2卷引用:上海市浦东新区2022-2023学年高一上学期期末数学试题
名校
7 . 对于给定集合
,若集合
中任意两个不同元素之和仍是集合
中的元素,则称集合
是“封闭集合”.设
为实常数且
,集合
,证明:集合
为“封闭集合”的充要条件是:存在整数
,使得
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cd5371a6f0f82c65dd22f75f8b807c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a3ac83c571110d41a396d12d8eea1c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01addf1c0dae299be04495dec2a3c733.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70a141495f9abd68126822a2ae920aed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efd44d872abf0e0480c139e86d9bb5c1.png)
您最近一年使用:0次
名校
解题方法
8 . 对于实数构成的集合
.若对任意
都有
(其中“
”表示普通的乘法运算),则称集合
对“
”是封闭的.
(1)已知集合
,判断
是否属于集合
;
(2)在(1)的条件下,若
,证明
的充要条件是
;
(3)若集合
对“
”都是封闭的,试判断
是否对“
”封闭,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cffa35373ec4e4684107b42adb7a5161.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8af42f2ec410ad1b28be69d3415ed10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a9f1ff137e76626b7b608cef7c36349.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2468403b3eba9e40bfa36f464e927738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cffa35373ec4e4684107b42adb7a5161.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2468403b3eba9e40bfa36f464e927738.png)
(1)已知集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50dae68b646f975a8a0c6bed67d028ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e57ed82958abb00776e75987aa62d723.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)在(1)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9ecef225b27b5857d2d76fbe5b34982.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/caf22d7d1a965bda25168a233fb6290c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bff58fdfe14af9fb8aa0e0cf0d60853a.png)
(3)若集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6bce3d91ca23b86d8c6625f2632e437.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2468403b3eba9e40bfa36f464e927738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81a3375139541ed61929fa658f16bb7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2468403b3eba9e40bfa36f464e927738.png)
您最近一年使用:0次
名校
9 . (1)求证:已知
,
,
,
,
,并指出等号成立的条件;
(2)求证:对任意的
,关于
的两个方程
与
至少有一个方程有实数根(反证法证明);
(3)求证:使得不等式
对一切实数
,
,
都成立的充要条件是
,
,
且
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/941b8c37cb9b036a5d7faa7eac01fa6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/878f834c03d26711f64bb3abe20e5488.png)
(2)求证:对任意的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb63478132d4c1fef3c17e591919da83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ace8f8a779c8f039407b7cae737d7212.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/751ee06608e9b40cd42cc4b48165e37c.png)
(3)求证:使得不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e774028355336f9a47e4e5194f3e7b06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
![](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/fff8a8a07e9fab2efc5be33f1339112f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0ad8d91c1ce139fbf2382a6e8a8f674.png)
您最近一年使用:0次
10 . 分式线性变换又称为莫比乌斯变换,它是定义在复数集中形如
的变换,其中w称为z的“像”,z称为w的“原像”.
(1)若
,求i的“像”以及
“原像”;
(2)若
,
,求证:
的充要条件是
;
(3)若
,
,z满足
,求z的“像”在复平面上所构成图形的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae7192583ba609cb106ade4e4488dd15.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49800f57be0280b700ec3e43a5c81449.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/186bb9626ba707655b540871c863bdc4.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c2c9d5ac204f207fc4edfd2160e7b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa828aaf76504bf5e4a749e28ff3815f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f525f4df6befc8fcf566d6f4f7d2150.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/475e17c54117d4b846275df1ba74b26a.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adebd26bdc1c9f97d05f111fb22b1073.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43b83b93d6b7241c2db386d5571b9932.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f88fe440162463512c88bb099ea959ff.png)
您最近一年使用:0次
2022-04-25更新
|
511次组卷
|
2卷引用:上海交通大学附属中学2021-2022学年高一下学期期中数学试题