横向
1
Comparison of two quantities
5
Difference between highest and lowest values
6
U-shaped curve of a quadratic function
7
Mathematical rule or equation
8
Three-sided polygon
10
Symbol representing unknown value
13
Collection of distinct elements
纵向
2
Sum divided by count
3
Number less than zero
4
The number representing nothing
8
Proven mathematical statement
9
Visual representation of data
11
Corner point of a polygon
12
Middle value in an ordered dataset