解题方法
1 . 如图,在四棱锥
中,四边形
为正方形,平面
平面
,
是边长为2等边三角形,点
分别为
的中点,点
为线段
上一点(包括端点).
为线段
的中点,求平面
和平面
夹角的正弦值;
(2)当直线
与平面
所成的角最大时,求出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/342d452a7b850cd3a15b23619ad39bd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/177678001b2ccde1db8f57fa5e017002.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d730ceac3b62e43c6a2761c3754479c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6612c697aa43a72115e5dce1106c0557.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bc46688d8723cf2003fc25890265200.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7abd284f76d9f5769bc189508ce2572b.png)
(2)当直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bc46688d8723cf2003fc25890265200.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad0d6d600e2676abc87e05cde8aebc1a.png)
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2 . 某商场为促进消费,规定消费满一定金额可以参与抽奖活动.抽奖箱中有2个蓝球和2个红球,这些球除颜色外完全相同.有以下两种抽奖方案可供选择:
(1)若顾客选择方案A,求其所获得奖池金额X的分布列及数学期望;
(2)以获得奖池金额的期望值为决策依据,顾客应该选择方案A还是方案B?
初始奖池 | 摸球方式 | 奖励规则 | |
方案A | 30元 | 不放回摸2次,每次摸出1个球. | 每摸出一个红球,奖池金额增加50元,在抽奖结束后获得奖池所有金额. |
方案B | 有放回摸2次,每次摸出1个球. | 每摸出一个红球,奖池金额翻倍,在抽奖结束后获得奖池所有金额. |
(1)若顾客选择方案A,求其所获得奖池金额X的分布列及数学期望;
(2)以获得奖池金额的期望值为决策依据,顾客应该选择方案A还是方案B?
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解题方法
3 . 如图,在长方体
中,
分别在
上.已知
,
.
截长方体
的截面,并写出作法;
(2)求(1)中所作截面的周长;
(3)长方体
被平面
截成两部分,求体积较小部分的几何体的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c31361392542709815a5960ba289deba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af770017632df22ed1f8e234f54c6dd5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d343ca820ade6b33980888dc2e9e49ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bff3ccea5989c60e51e321af3f53f54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
(2)求(1)中所作截面的周长;
(3)长方体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bff3ccea5989c60e51e321af3f53f54.png)
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4 . 已知函数
.
(1)若
,求
的单调区间;
(2)若
恒成立,求
的取值集合.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0aefefa22770c10304803252d376532.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f22a4a0dd7307a1323d25331e60782d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6acb0f1ac694dd177e99fc385f23318.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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5 . 设函数
.
(1)若
,求曲线
在点
处的切线方程;
(2)若函数
在区间
内单调递增,求k的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3cf85e80663b8cf9f1700939d7f100a.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3a2a34b4317deffa40ba34e269c2b81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ea9824af71c9da5db5a00ec06063024.png)
(2)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5265d99095b635f62c7915298ec0e963.png)
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名校
6 . 由四棱柱
截去三棱锥
后得到如图所示的几何体,四边形
是菱形,
为
与
的交点,
平面
.![](https://staticzujuan.xkw.com/quesimg/Upload/formula/172e5fbd9df8b19e0786fad909d36d63.png)
平面
;
(2)若二面角
的正切值为
,求平面
与平面
夹角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b2c9c1f4650ed52c69a559df131b2a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18244d656ae5cc603707e4a076269c0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a8d86cda29fe8beb90de622c237494f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/172e5fbd9df8b19e0786fad909d36d63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895d6f710d5f67e1d4c7408d50d77281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a40d8806b86572352ed08aa2b7f89f7.png)
(2)若二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b08f4c3ebb0794290702287550cc97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69a8b76e36783a69d14ec54af82c7df0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a40d8806b86572352ed08aa2b7f89f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
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解题方法
7 . 在
中,内角
的对边分别为
,且
.
(1)证明:
;
(2)若
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ce9be308d317f892707318186933e3.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85d5b1b24e2d918646afd0e16e119698.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7e98d0f8a770c7d81efa1712b17cb73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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8 . 已知函数
.
(1)当
时,求证:
;
(2)若
存在两个零点,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3a40a9e01ceb575116ea4cddb0afc88.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0606c4ffcfe6f4709155d1e8671ee57.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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解题方法
9 . 已知
的展开式
(1)求展开式中所有项的系数和;
(2)求展开式中二项式系数最大的项;
(3)将展开式中所有项重新排列,求有理项不相邻的概率.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92bfec853f5b7738808f99aa637c98b4.png)
(1)求展开式中所有项的系数和;
(2)求展开式中二项式系数最大的项;
(3)将展开式中所有项重新排列,求有理项不相邻的概率.
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10 . 从①
;②
;③
, 这三个条件中任选一个, 补充在下面问题中, 并加以解答.
在
中,三边
分别是角
的对边, 若______.
(1)求C;
(2)若
,求
的面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d8447a2411972b1375712e3c28cdca6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65d983612b3c1977916dd721d3413bce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50ad4300ec11d8da30369d44a3cdf07d.png)
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e5ba3badffe942dcfb60da88629e7b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e70100bd019ce2be544ccd266318b0bd.png)
(1)求C;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6de1d395e6c48c0676a1488a299479d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bf59f210a4f3916022847a4fd61b6ed.png)
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