先算出横截面的面积然后乘以坝长就可以.
梯形的面积是 （上底+下底）×高 ÷2
所以是：（5.6+16.4）×5÷2 × 320 ＝17600
答案是17600立方米.
一条拦河坝,坝长320米,横截面是一个梯形,上底长5.6米,下底长16.4米高5米.修这条拦河坝需土多少立方米
一条拦河坝,坝长320米,横截面是一个梯形,上底长5.6米,下底长16.4米高5米.修这条拦河坝需土多少立方米
数学人气：194 ℃时间：2019-10-17 04:38:46
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