一道数学题目,关于相关变化率的,跪求讲解~

一道数学题目,关于相关变化率的,跪求讲解~
A man 1.8m tall is walking at the rate of 0.9m/s toward a streetlight pole 5.4m igh.(a)At what rate is his shadow length decreasing?(b)How fast is the tip of his shadow moving?
aa不如 1年前 举报
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