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【OG20-P277-287题】
A certain truck uses112 +kv2 gallons of fuel per mile when its speed is v miles per hour, where k is a constant. At what speed should the truck travel so that it uses 512 gallon of fuel per mile?
(1) The value of k is 110800 .
(2) When the truck travels at 30 miles per hour, it uses 16 gallon of fuel per mile.
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题干：求1/12+kv^2=5/12时v的值，k是常数，能把k的值求出来即可
条件1：k=1/10800，充分
条件2：1/12+k*30^2=1/6，可以求出k的值，充分
题目讨论 （2条评论）
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贾思敏
害，应是没把30看成v带进去算
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2021-09-13 13:54:44
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EMEI
ｖ不能取负数
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2019-08-06 08:55:27
