(1)已知2x=5,log4
=y,求x+2y的值;
(2)若
=
,求3sin2
-sin
cos
-cos2
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7294f5ae2a24ff42e84cd9773b2a7287.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b66e69ad4b12f7f2b2c9da8107106eb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
更新时间:2019-12-14 14:18:59
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解答题-应用题
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适中
(0.65)
解题方法
【推荐1】某科研单位的研究人员对某种细菌的繁殖情况进行了研究,在培养III.中放入了一定数量的细菌,发现该细菌的个数增长的速度越来越快.经过2小时,细菌的数量变为36个;经过4小时,细菌的数量变为81个.现该细菌数量
(单位:个)与经过时间
个小时的关系有两个函数模型
与
可供选择.
(1)试判断哪个函数模型更合适,并求出该模型的解析式;
(2)求开始时放入的细菌的数量,并求至少经过几个小时该细菌的数量能多于开始放入时的10000倍?(参考数据:
,
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc3b9438c0fd1f7ed51cc5d346356166.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe2bce637c54faca9ef162ed983dec68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbad4767ea3ffcd9dbc6473bfb64950a.png)
(1)试判断哪个函数模型更合适,并求出该模型的解析式;
(2)求开始时放入的细菌的数量,并求至少经过几个小时该细菌的数量能多于开始放入时的10000倍?(参考数据:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bfb5a9ba77ae3ff13997225d5ba02f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70345587c2d90c50abb161cd7e158a67.png)
您最近一年使用:0次
解答题-问答题
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适中
(0.65)
名校
解题方法
【推荐1】(1)计算:
①
;
②
.
(2)解不等式:
③
;
④
.
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bec1545615107a1ef7fc4186e09a1bc3.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5527c88d4f0cb6f550e606849dd0a46.png)
(2)解不等式:
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efb38b7e1964cc223a6d2a3e59ca9331.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf1863d3a05613d4a33b4e7cb8d7ba6e.png)
您最近一年使用:0次
解答题-计算题
|
适中
(0.65)
解题方法
【推荐2】求值:
(1)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/851f208210b3422650daee878da5c1dc.png)
(2)已知角
的顶点与原点O重合,始边与x轴的非负半轴重合,它的终边过点
,求
的值
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/851f208210b3422650daee878da5c1dc.png)
(2)已知角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24fee7d3d2e63ade129eae63b27c2bd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a7ea1ed5f6409e7c4047e30b126448c.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐1】(1)已知
,求
的值.
(2)已知
,且
,求
,
的值;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/536e072eb0439a5e5b430cd55a129374.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00f2f54fb78ef3ad318af2f36d528843.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8f55b8836b41be612a52ca9caf97006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69b4cab645c97f6d1710f803ef6a8436.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b4179e1ab8705cf19ea7aaf48888843.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d66c03d4ca06819a6ce7fc8ea6de0f0.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
解题方法
【推荐2】已知
.
(1)当
时,求
的值;
(2)求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69b4cab645c97f6d1710f803ef6a8436.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8f55b8836b41be612a52ca9caf97006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cc9750c313ee972124cb62c4a6fb7ea.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7eedcf83b3eebf23bd4e035c7101f3b5.png)
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