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华师版九年级《数学》上册第46页的例2第2小题及证明过程值得商榷.题目证明:如果a/b=c/d,那么a/(a-b)=c/(c-d).证明∵a/b=c/d∴ad=bc,①
Problem 2 and Problem 2 of Example 2 on page 46 of the Chinese version of the Mathematics of the Yearbook of China Normal University are worth discussing. The title proves that: a / (ab) = c / (cd) if a / b = c / ∵a / b = c / d∴ad = bc, ①