梯形的面积0.3平方米,上底7分米,高4分米,下底多少分米?
梯形的面积0.3平方米,上底7分米,高4分米,下底多少分米?
数学人气:908 ℃时间:2019-11-16 12:14:27
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设:下底为x分米 (7+x)×4÷2=30 x=8
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