N-7-9-S05_知道若a:b=c:d，則a/b=c/d 及ad=bc。 | 合作夥伴 | 均一教育平台

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N-7-9-S05_知道若a:b=c:d，則a/b=c/d 及ad=bc。

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N-7-9-S05_知道若a:b=c:d，則a/b=c/d 及ad=bc。