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歡迎您訪問數學考題練習:如果一個圓柱的側面積為16,那么這個圓柱的高l!

數學考題練習:如果一個圓柱的側面積為16,那么這個圓柱的高l

更新時間:2024-01-12 16:28:51作者:貝語網校

如果一個圓柱的側面積為16,那么這個圓柱的高l與底面半徑r之間函數關系的大致圖象是

A.

B.

C.

D.

試題答案

D

試題解析

根據題意有:2πr•l=16;故r與l之間的函數圖象為反比例函數,且根據l,r實際意義r,l應大于0,其圖象應在第一象限;

解答:∵2πr•l=16

∴l=(r>0,l>0)

故選D.

點評:現實生活中存在大量成反比例函數的兩個變量,解答該類問題的關鍵是確定兩個變量之間的函數關系,然后利用實際意義確定其所在的象限.

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