background
black
blackboard
board
calculate
calculation
chalk
chalkboard
class
classroom
closeup
college
different
education
equation
exam
formula
formulas
geometric
geometry
knowledge
learn
lesson
many
math
mathematical
mathematics
nobody
object
school
science
sign
solution
study
studying
symbol
teach
teacher
theory
university
white
write
written
定額
Many different math formulas written on chalkboard, closeupの素材 [FY310194530473]
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