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19好像是x＜-二分之九
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太给力了，你的回答完美地解决了我的问题，非常感谢！
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The police discover the body of a murder victim. Critical to solving the crime is determining when the murder was committed. The coroner arrives at the murder scene at 12:00 P.M. She immediately takes the temperature of the body and finds it to de 94.6 degrees. She then takes the temperature 1 hour later and finds it to be 93.4 degrees. The temperature of the room is 70 degrees.Q:&1.the rate of change of the temperature of an object(with respect to tine) is k(T-R),where T is the temperature of the object t hours after being placed in some other environment and R is the temperature of the other environment
write that statement in calculus terms using T,t,dT/dt and a specific R valueQ2. it turns out that this means the function involves a log derivative and the function is:ln(T-70)=kt+c,k and c are constants. Differentiate both sides of this with respect to t to show that this does result from your answer in #1
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你的回答完美的解决了我的问题，谢谢！
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