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It's still hard to draw inferences about seventh grade mathematics.
It's still hard to draw inferences. This set of books has recently been upgraded, and famous teachers have been specially invited to record video courses for each chapter in the book, which is especially suitable for self-study at home or as a home to consolidate and strengthen institutional courses! And there are no other platforms for this course at present. The new idea of Olympic mathematics learning starts from textbooks and climbs slightly to expand training.