已知函数
且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37fa1476cf3552b9ae91ef039b1c6c80.png)
(1)若函数
的图象经过P(3,4)点,求a的值;
(2)若
,求a的值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fb2c12b8a8689959b4197ee57fa4eb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37fa1476cf3552b9ae91ef039b1c6c80.png)
(1)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4434f3850e5adaa624b18c881b97c02.png)
更新时间:2020-09-03 13:08:38
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解答题-应用题
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较易
(0.85)
名校
【推荐1】退耕还林工程就是从保护生态环境出发,将水土流失严重的耕地,沙化、盐碱化、石漠化严重的耕地以及粮食产量低而不稳的耕地,有计划,有步骤地停止耕种,因地制宜的造林种草,恢复植被.某地区执行退耕还林以来,生态环境恢复良好,
年
月底的生物量为
,到了
月底,生物量增长为
.现有两个函数模型可以用来模拟生物量
(单位:
)与月份
(单位:月)的内在关系,即
且
)与
.
(1)分别使用两个函数模型对本次退耕还林进行分析,求出对应的解析式;
(2)若测得
年
月底生物量约为
,判断上述两个函数模型中哪个更合适.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e946baf1316ac1f219398ecedadf6cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5667e2bd070a372dd123975cae0e7600.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c282b23f9b725284ecd063d66911a0b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e748d705450bf9f54559be777f8c50af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3850522402f6327552fe4f3421506b0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d33da711e50e96568facb18cef27165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46452a290c9dc8b74fd756b10b902ee4.png)
(1)分别使用两个函数模型对本次退耕还林进行分析,求出对应的解析式;
(2)若测得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e946baf1316ac1f219398ecedadf6cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1247810da7a9577bca230b8f12769326.png)
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解答题-问答题
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较易
(0.85)
名校
解题方法
【推荐2】已知函数
且
的图象过点
,
.
(1)求
的值;
(2)记
在区间
上的值域分别为集合
,若
是
的必要条件,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fbbcaac8525048a5489034e90bd6269.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb1ebc40126e8670e98e25c50f042511.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e7a98a3b8efc4c726892c2a664764e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d8f18959069f70a9c4e70f1a52d47e9.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8fd1e808e015f4cb43d2e3a0529ac6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bbb1af40cb43a243938534580b84559.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ed006b944ea64f970fee46e2f558467.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e23af61cd402b3789af2401bde9cbefe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
您最近一年使用:0次