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Why didn't the complete solution of the ninth grade mathematics textbook published by Shanghai Education Press be sold?
Selling complete answers to math textbooks is not conducive to children's personal positive thinking ability, just copying answers.

Because all the exercises in the textbook have answers, children will only copy the answers and will not take the initiative to think, resulting in insufficient imagination and thinking.

Because all the exercises and exercises in junior high school textbooks are provided by textbooks, if the student takes this answer, it will replace her own active thinking ability. He will only copy the answer and let the teacher see the homework. His answers are all right. However, there was no such answer in the exam, and he couldn't answer anything. Therefore, this textbook is completely understandable and will not be used by children.