若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c3ccf147a8382ac58dc73b164df3462.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/131efbb40d6630cf34964189000af36f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c3ccf147a8382ac58dc73b164df3462.png)
更新时间:2017-08-15 16:37:36
|
相似题推荐
填空题-单空题
|
适中
(0.65)
名校
解题方法
【推荐1】已知
,
为第三象限角,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8966973a9c5a369d1de7d9b40334c3f.png)
___ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8293b0796b0288b55fe5ce222773c987.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8966973a9c5a369d1de7d9b40334c3f.png)
您最近一年使用:0次
填空题-双空题
|
适中
(0.65)
名校
解题方法
【推荐2】声音是由物体振动而产生的声波通过介质(空气、固体或液体)传播并能被人的听觉器官所感知的波动现象.在现实生活中经常需要把两个不同的声波进行合成,这种技术被广泛运用在乐器的调音和耳机的主动降噪技术方面.
(1)若甲声波的数学模型为
,乙声波的数学模型为
,甲、乙声波合成后的数学模型为
.要使
恒成立,则
的最小值为____________ ;
(2)技术人员获取某种声波,其数学模型记为
,其部分图像如图所示,对该声波进行逆向分析,发现它是由S1,S2两种不同的声波合成得到的,S1,S2的数学模型分别记为
和
,满足
.已知S1,S2两种声波的数学模型源自于下列四个函数中的两个.
![](https://img.xkw.com/dksih/QBM/2021/4/29/2710414906130432/2785822478147584/STEM/0fc4af214bc64755ae531956a531ed4d.png?resizew=313)
①
; ②![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03b3f17664e57122bba6d8d8dd75c914.png)
③
;④![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c4517380712240e48c4569863e6fdf.png)
则S1,S2两种声波的数学模型分别是_________ .(填写序号)
(1)若甲声波的数学模型为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecf0499eb96d6af7cdfea79540ae2860.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45dbec5a3ac2e57eeb24e82af5c4667f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd67b594f222d83c217262f94089ddc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c419949314258c61e4436e16477fa42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6581916f5a65edfea257c804efee007e.png)
(2)技术人员获取某种声波,其数学模型记为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26e91406484c332ac8fc96a54c7e187b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2709ca478fb15ea08e8aa55328eae8e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a82a1224e47f31ecdfffd328d5a3ab6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/585abcc61e51a9e73513b95155a8da45.png)
![](https://img.xkw.com/dksih/QBM/2021/4/29/2710414906130432/2785822478147584/STEM/0fc4af214bc64755ae531956a531ed4d.png?resizew=313)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c179fc593b49cf3a5d57b691b5b2ee45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03b3f17664e57122bba6d8d8dd75c914.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3bd853f3df2d9dbc4b846d296d5297d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c4517380712240e48c4569863e6fdf.png)
则S1,S2两种声波的数学模型分别是
您最近一年使用:0次
填空题-单空题
|
适中
(0.65)
名校
解题方法
【推荐1】已知
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00b80751c98f9991b9cfc03923a98834.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60f847cbb97f9cd4c34db9332b013e76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c65b6c42393fae47c51101713167ff71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00b80751c98f9991b9cfc03923a98834.png)
您最近一年使用:0次
填空题-双空题
|
适中
(0.65)
解题方法
【推荐2】已知
,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc903c19f7b3b0aa58cdb0cdb7b062a0.png)
______ ,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38dd8aad9cfb5e1fe2a45d80923f1571.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dcbe8b4bcd32e5a64ebfd873f8cbb2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72495a9befbd8034977394ba7ea148ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc903c19f7b3b0aa58cdb0cdb7b062a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38dd8aad9cfb5e1fe2a45d80923f1571.png)
您最近一年使用:0次
填空题-单空题
|
适中
(0.65)
解题方法
【推荐3】已知
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91306e5cec1e557af95deb0f220b7bf9.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9fecf0b79f2a1bfd06934d620495c90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91306e5cec1e557af95deb0f220b7bf9.png)
您最近一年使用:0次