Current price = original price × discount.
Original price = current price ÷ discount.
Discount = current price ÷ original price.
Tax rate = tax payable ÷ various incomes × 100%.
Taxable amount = income x tax rate.
All kinds of income = tax payable/tax rate.
Interest = principal × interest rate× deposit period.
Principal = interest/interest rate/deposit period.
Interest rate = interest/principal/deposit period.
Term = interest/principal/interest rate.
Sum of principal and interest = principal+interest.
Sum of principal and interest = principal ×( 1+ interest rate× deposit period).
Transverse area of cylinder = bottom circumference × height.
Volume of cylinder = bottom area × height.
Bottom area of cylinder = volume/height.
Height of cone = volume/bottom area ×3.
The bottom area of the cone = volume/height ×3.
Scale = distance on the map: actual distance.
Actual distance = distance on map/scale.
Distance on the map = actual distance × scale.
Number of articles ÷ number of drawers = quotient+remainder, and at least quantity = quotient+1.
Mathematical formula is an expression method that people find some connection between things in nature and express it in some way. It represents the equal or unequal relationship between the quantities of different things in nature, accurately reflects the internal and external relations of things, and is the basis for us to reach another thing from one thing, so as to better understand the essence and connotation of things.