Gao er mathematics formula cake
6 knives supplement: cut like a Rubik's cube, and only need 6 knives to ask: 27 questions of the same size are answered by a mathematical formula: questions of the same size are answered by a mathematical formula: not every question can be calculated by a formula, and some questions need to be done by life experience. I won't count this. I'm sorry if I have to calculate the formula.