横向
1
Math using letters for unknown values
5
Split into equal parts
6
Exact correspondence on both sides
7
Total distance around a shape
9
U-shaped curve of a quadratic function
纵向
2
Collection of distinct elements
3
System of ordered marks for measuring
4
Distance from center to edge of circle
7
Parts per hundred
8
Mathematical rule or equation
10
Symbol representing unknown value
11
Number less than zero
12
Number divisible only by 1 and itself
13
Visual representation of data