algebra
background
black
blackboard
board
book
calculate
chalk
chalkboard
class
classroom
college
complex
complicated
concept
drawing
education
equation
exam
formula
girl
green
hand
high
illustration
intelligent
knowledge
learn
lecture
lesson
line
math
mathematical
mathematics
number
pattern
person
physics
plus
problem
school
science
solution
student
study
studying
symbol
teach
university
woman
定額
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