機器
accounting
add
adding
addition
background
bills
bookkeeping
brown
budget
business
buttons
calculate
calculation
calculator
calculus
calulate
closeup
computer
concept
count
counting
digitron
digits
display
divide
division
education
equals
exam
exchange
exchange rate
exchequer bill
finance
finances
financial
functions
green
hischool
light
macro
math
mathematics
maths
money
multiply
numbers
object
office
rates
render
school
science
scientific
stationery
stock
subtract
sum
surface
table
tax
transparent
university
wood