algebra
background
black
black board
blackboard
board
calculate
chalk
chalk board
chalkboard
class
classroom
college
complex
complicated
concept
dirty
drawing
education
equation
exam
formula
green
high
illustration
intelligent
knowledge
learn
lecture
lesson
line
math
mathematical
mathematics
number
pattern
physics
plus
problem
school
science
sign
solution
study
studying
symbol
symbols
teach
teacher
theory
trigonometry
university
white
write
writing
定額
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