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蜡烛高度线性减少: h(t) = 25 - 0.8t cm, t 以分钟为单位。(a) 蜡烛何时燃尽?(b) 在物理域内画 h 的图。
蜡烛高度线性减少: h(t) = 25 - 0.8t cm, t 以分钟为单位。(a) 蜡烛何时燃尽?(b) 在物理域内画 h 的图。
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