一个面积为100 cm2的等腰梯形，上底长为x cm，下底长为上底长的3倍，

一个面积为100 cm²的等腰梯形，上底长为x cm，下底长为上底长的3倍，则把它的高y表示成x的函数为( )

A.y=50x(x＞0) B.y=100x(x＞0)

C.y=

(x＞0) D.y=

(x＞0)

答案

思路解析：由·y=100,得2xy=100.∴y= (x＞0).

答案：C

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答案

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