名校
解题方法
1 . (1)已知
克糖水中含有
克糖(
),再添加
克糖
)(假设全部溶解),糖水变甜了.这一事实可以表示为不等式
,证明这个不等式成立.
(2)已知
都是正数,求证
;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d100c22435a23e017cfe6f535379d3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87a3a82d6b1b6ed16c30367f038c16bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac2bdea081bcd1c706cc82f906f226ce.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a14c388e1e2e5a2ff1ccf6caffbee0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/308b2921746b1ee3f499e220c371ca96.png)
您最近一年使用:0次
2023-11-07更新
|
102次组卷
|
2卷引用:陕西省安康市名校2023-2024学年高一上学期期中联考数学试题
11-12高三上·山东济宁·单元测试
名校
解题方法
2 . 如图,
是边长为4的正方形,
平面
,
,
.
(1)求证:
平面
;
(2)设点
是线段
上一个动点,试确定点
的位置,使得
平面
,并
证明你的结论.
![](https://img.xkw.com/dksih/QBM/2011/12/1/1570553879707648/1570553884844032/STEM/613be89289f5414195881fc0ec9186cd.png?resizew=48)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8d2d217e9bcd059908f117dfc4d4259.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b059af31eed9d4ec27f9aad55ae41df6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/015a9b4497e91d358be5fc194ac9461f.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e56fdf217165748fafe938b64fa08179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
(2)设点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae0d2ea2af3f0ab189c4694eeb52ce43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c0bfeadcf17b2a45896071f07a4a5a.png)
证明你的结论.
您最近一年使用:0次
12-13高二上·浙江杭州·期中
解题方法
3 . 如图,直三棱柱
中,已知
,
,
是
中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/9/1f651409-9fc2-4241-b792-5828526e8e09.png?resizew=181)
(1)求证:
平面
;
(2)当点
在
上什么位置时,会使得
平面
?并证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e47739be8ea23755014d80b408e6a36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/9/1f651409-9fc2-4241-b792-5828526e8e09.png?resizew=181)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/762b8cac66d86a013ba839266b023e54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bea124cef7ab3fd8069243e9894d1c59.png)
(2)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4560fa4ad459b58b723c74bd24e51ebf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/431e8bf1a5f9ac9a2ec82c11f31a4afe.png)
您最近一年使用:0次
4 . 如图,已知四棱柱
的底面为菱形,
,
,
,
,
是棱
上的点.
为直棱柱;
(2)若
,求平面
与平面
所成锐二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e918b70b02a73685e3c536c7f380e2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92105835f8075cb75dff244e908370b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ecd5876d3dfe2bdab8d99ffd64b9933.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cb8c3e6d8e2843a2783a409e130bc0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e539f26ed5e0b20ff7220559324869a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f84d2566040fde7824b283f7d22de9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7253ffd3fc633d861810ee2e872188b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
您最近一年使用:0次
5 . 已知函数
.
(1)讨论函数
的单调性;
(2)若
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/858cbbe1882110dd49240684c3ba24e6.png)
(1)讨论函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d191d6de821fbb06a51b5a20112db6de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/141b2bbd98551063847f63aa606010c9.png)
您最近一年使用:0次
名校
6 . 已知函数
.
(1)求
的最小值;
(2)若
的最小值为
,正实数a,b,c满足
,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c35e5c2939fb6320230190d5dc472120.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edbab9eb75db03784bd3b20a4226884b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/218f1a94f2cfd0871fda90b064a2c9d9.png)
您最近一年使用:0次
2024-04-12更新
|
181次组卷
|
4卷引用:陕西省安康市汉滨区2024届高三下学期高考模拟(五)文科数学试题
7 . 如图,在底面为正方形的四棱台
中,平面
平面
,已知
.
;
(2)若
,求直线
与平面
所成角的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce04b35c265cc9c48b60204bd2f718ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9957862afc0f0972be382c034c882991.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/901567f610a4e89005799f11e347166e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02864602e30b261c2de2fffb52193a92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/028856d5101687dd8eaf130846489cfd.png)
您最近一年使用:0次
2024-04-08更新
|
233次组卷
|
2卷引用:陕西省安康市高新中学、安康中学高新分校2024届高三下学期4月联考模拟预测(理科)数学试题
名校
解题方法
8 . 已知函数
.
(1)若函数
在
上单调递增,求实数
的值;
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8787d90a6ad512aee79e3de7486eb9de.png)
(1)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d562dc22dfb3b81d0c3f88b54d063c2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e2fa47404af9de30af53b11f54c0527.png)
您最近一年使用:0次
2024-06-14更新
|
373次组卷
|
3卷引用:陕西省安康市高新中学、安康中学高新分校2024届高三下学期5月模拟预测数学(理)试题
9 . 如图,在四棱锥
中,
.
;
(2)若二面角
的大小为
,求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd73d9ea0f30392a6ed097e588045523.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/268559207a04b28fe35a1198bda23019.png)
(2)若二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02a7ba7cd0c654714c967a900513ba16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0211da37e92f915e781691296578ba0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
您最近一年使用:0次
10 . 己知函数
.
(1)当
时,求曲线
在点
处的切线方程;
(2)若函数
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecc42ea0907a7189af52245b9a7fbf9e.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c9f8845aa2b51c460f2d798c9f62fa3.png)
(2)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d06e453dc7e768a81fee6bb9447bd84c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b96073735e3a7a87cbf22360afd9fb2.png)
您最近一年使用:0次