大师作文网大学数学微积分的简单应用题 美国大学的 读不懂题
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大学数学微积分的简单应用题 美国大学的 读不懂题
A ballon is rising from the ground.When it is 30 meters above the ground,it is rising at a rate of3 meters per second.An observer is on the ground 40 meters from the point where the balloon originated.
At what rate is the balloon moving away from the observer at this moment when the balloon is 30
meters above the ground?Include units in your answer.
A ballon is rising from the ground.When it is 30 meters above the ground,it is rising at a rate of3 meters per second.An observer is on the ground 40 meters from the point where the balloon originated.
At what rate is the balloon moving away from the observer at this moment when the balloon is 30
meters above the ground?Include units in your answer.
一个气球从地面升起.当它离地面30米时,速度是3米每秒.地面上距离气球升起的地方40米处有个人.从他看来,当气球在30米高处的那一刻,气球的运动速度时多少?请包含单位. 再答： 
再答：
再答： 这是一道AP calculus中的经典题目，已经给出解答。如果还有不明白的，可以继续追问。
再答：
再答： 这是一道AP calculus中的经典题目，已经给出解答。如果还有不明白的，可以继续追问。