78×2/(9+17)
=156/26
=6(分米)
一个梯形的面积是78平方分米,上底9分米,下底17分米,求高
一个梯形的面积是78平方分米,上底9分米,下底17分米,求高
数学人气:171 ℃时间:2019-11-24 12:54:26
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