横向
1
Sum divided by count
5
Difference between highest and lowest values
6
Line segment connecting two circle points
7
Symbol representing unknown value
13
Longest side of a right triangle
纵向
2
Split into equal parts
3
Divisible by two
4
Number divisible only by 1 and itself
8
Collection of distinct elements
9
System of ordered marks for measuring
10
Three-sided polygon
11
Comparison of two quantities
12
U-shaped curve of a quadratic function