Dry goods: Formulas and theorems that are not in junior high school math books, collect them for your children Dry goods: Formulas and theorems that are not in junior high school math books, collect them for your children Dry goods: Formulas and theorems that are not in junior high school math books, collect them for your children Dry goods: Formulas and theorems that are not in junior high school math books, collect them for your children Dry goods: Formulas and theorems that are not in junior high school math books, collect them for your children Dry goods: Formulas and theorems that are not in junior high school math books, collect them for your children