名校
1 . 已知函数
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09ea034ad66364571736cc8ba56685d5.png)
A.![]() ![]() |
B.![]() ![]() |
C.![]() |
D.![]() ![]() |
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解题方法
2 . 若物体原来的温度为
(单位:
),环境温度为
(单位:
),物体的温度冷却到
,单位:
)与需用时间
(单位:分钟)满足
为正常数.现有一杯开水
放在室温为
的房间里,根据函数关系研究这杯开水冷却的情况(
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a4438bae1705c0f26beddf41322c087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72917e7496b2e16cc180ee1a07119aff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25f64fa38725c136504f723019a18dc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72917e7496b2e16cc180ee1a07119aff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4ec99cb2bd2f6e13c4b18595866c21b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72917e7496b2e16cc180ee1a07119aff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc8a032085ddac76a9a32b1624be5a09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c4efe9a3cf942663c305eb2302a77f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b20f32335ee719e0ec95d3d4122c485.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/864119bc09a22913f982277ac1a99724.png)
A.当![]() ![]() |
B.当![]() ![]() |
C.若![]() ![]() |
D.这杯水从![]() ![]() ![]() ![]() |
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