function
algebra
analysis
background
board
calculate
calculation
calculus
chalk
chalkboard
classroom
closeup
college
down
education
equation
exam
examples
exercise
female
formula
geometric
geometry
green
hand
handwriting
intelligence
knowledge
learning
lecture
lesson
math
mathematical
mathematics
person
professor
schooling
science
sign
student
teach
teacher
teaching
training
university
white
woman
wooden
writing
written
定額
Teacher writing down math equation on green board, closeupの素材 [FY310234806716]
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