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What is the theme of the next math book in grade seven? People's Education Press Edition
Chapter 5: Intersecting lines and parallel lines (5. 1 intersecting lines 5.2 parallel lines and judgment; 5.3 Nature of parallel lines; 5.4 pots)

Chapter 6: Cartesian coordinate system (6. 1 plane rectangular coordinate system, 6.2 coordinate simple application method)

Chapter 7: Related fields of triangle (7. 1 triangle; 7.2 A polygon with a triangle inner angle of 7.3, the interior of which is related to the mosaic of 7.4 subjects)

Chapter 8: Binary linear equations (8. 1 binary linear simple formula 8.2 elimination method to solve linear equations, 8.3 8.4 practical problems of two sets of solutions of ternary equations, such as binary simple formula)