#E. 练7.4梯形面积

    Type: RemoteJudge 1000ms 256MiB

练7.4梯形面积

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题目

在梯形中阴影部分面积是150平方厘米,求梯形面积。

image

输入输出样例

输入

输出

输出梯形面积(保留两位小数)。

样例