algebra
background
black
blackboard
board
calculate
chalk
chalkboard
class
classroom
college
complex
complicated
concept
drawing
education
exam
female
formula
hand
holding
human
knowledge
learn
lecture
lesson
math
mathematical
mathematics
number
pattern
person
physics
plus
problem
school
science
shape
sign
solution
study
symbol
teach
teacher
theory
university
white
write
定額
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