The difference between that fourth edition and the seventh edition of advance mathematics

Improvement of typesetting and style, application of mathematical methods.

1. improvement of layout and style: the layout and style of the seventh edition are more beautiful, unified and easy to read than the fourth edition.

2. Application of mathematical methods: The seventh edition adds more practical application cases, which is convenient for readers to combine daily experience with mathematical methods and better understand the application of mathematics.

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Let me ask you a math problem. The same clothes have 1 1 colors, and now they need to be packed in 6 pieces (6 pieces in different colors). How to calculate? thank you