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[几何] 此题求面积我会啊

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isee posted 2021-8-10 00:13 |Read mode

Last edited by isee 2021-8-10 00:46源自 MindYourDecisions 18年的视频

图中数字表示面积

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kuing posted 2021-8-10 00:59

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连 BE 将所求分成两块，易知小的那块为 1.5，设另一块为 x，
则 `x:4.5=AB:BC=(x+3.5):7`，解得 `x=6.3`，
所以原题所求为 7.8。

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