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人民教育出版社出版的“初级中学课本代数上册教学参考书”(以下简称本书)第二分册(1957年1月第一版第二次印刷)第四章第一课学习新教材第(5)项里有一段话:“多项式因式分解的结果,可以用两种方法来进行检验:1)用乘法;2)用数目代替字母。”……(A段)
The Second Book of Reference Books for Junior Middle School Textbook Algebra on the Upper Secondary School Published by the People’s Education Press (the second edition of the first edition in January 1957) The fourth chapter of the first lesson The new textbook (5th) There is a paragraph in the “) item: ”The result of a polynomial factorization can be tested in two ways: 1) using multiplication; 2) using numbers instead of letters." ... (paragraph A)