Mathematics
Junior High
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どうして急にcが無くなったのかわかりません!
解説お願いします🙇‍♂️🙇‍♂️

6, ⑦より, (cx-13c): (cx-1lc)=3:4 (x-13):(x-11)=3:4
数学 ラ・サール過去問

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