Select content fragments from the book that embody mathematical principles and are interesting. The excerpt is as follows:

1. In the world of cooking, mathematics is not an abstract concept that is out of reach, but a practical tool everywhere. From the weighing of ingredients to the control of cooking time, from the proportions of recipes to the arrangement and combination on the table, mathematics is silently playing a role.

2. In the proportion of recipes, mathematics plays an irreplaceable role. The proportions of salt, sugar, soy sauce and other seasonings, as well as the combination of meat, vegetables and other ingredients, all require precise calculation and deployment through mathematical proportions. Only in this way can we cook delicious and nutritious dishes.