如果a,b,c,d成比例,那么一定是a:b=c:可能是a:c=b:
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![如果a,b,c,d成比例,那么一定是a:b=c:可能是a:c=b:](/uploads/image/z/8846090-26-0.jpg?t=%E5%A6%82%E6%9E%9Ca%2Cb%2Cc%2Cd%E6%88%90%E6%AF%94%E4%BE%8B%2C%E9%82%A3%E4%B9%88%E4%B8%80%E5%AE%9A%E6%98%AFa%3Ab%3Dc%3A%E5%8F%AF%E8%83%BD%E6%98%AFa%EF%BC%9Ac%3Db%EF%BC%9A)
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