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Is it difficult to get the first volume or the second volume of seventh grade mathematics published by PEP?
It is difficult to get into this book.

In the first chapter of grade seven, I began to learn rational numbers, including the classification, addition, subtraction, multiplication and division of rational numbers. In addition, concepts such as number axis, reciprocal, absolute value, reciprocal and scientific notation appeared, which changed greatly from the depth and breadth, difficulty and density of knowledge.