横向
1
Number less than zero
5
Mathematical rule or equation
7
Steepness of a line
8
U-shaped curve of a quadratic function
纵向
2
Sum divided by count
3
Number that divides evenly into another
4
Space between two intersecting lines
5
Part of a whole number
6
Symbol representing unknown value
7
Collection of distinct elements
9
Total distance around a shape