General operation rules of formula set 1 number of shares per share = total number of shares = 2 1 multiple times = multiple times1 Multiply = multiple × time = total price ÷ quantity = unit price 5 Work efficiency × working time = total workload ÷ Work efficiency = total working time ÷ working time = work efficiency 6 addend+addend = sum-one addend = another addend 7 minuend-subtree = difference minuend-difference divider = divider calculation formula of primary school mathematical graphics. Square c perimeter s area a side length perimeter = side length× 4c = 4a area = side length× side length S=a×a 2 cubic v: volume a: side length surface area = side length× side length× 6s table =a×a×6 volume = side length× side length v width )× 2c = 2 (a+b). Area = length× width S=ab 4 cuboid V: volume S: area A: length B: width H: high surface area (length× width+height volume = length× width× height V=abh 5 triangle S area A bottom H height area = bottom× height ÷2 s=ah÷2 triangle height = area× 2 ÷. × h ∏ 2 8 circular S area C circumference ∏ d= diameter r= radius circumference = diameter×∏= 2×∏× radius C=∏d=2∏r area = radius× radius×∏ 9 cylinder V: volume H: height S; Bottom area R: bottom radius C: bottom circumference lateral area = bottom circumference× high surface area = lateral area+bottom area× 2 volume = bottom area× high volume = lateral area ÷2× radius 10 cone V: volume H: height S; Base area r: base radius volume = base area × height ÷3 Elementary school mathematical formula and difference problem formula (sum+difference) ÷ 2 = large number formula (sum-difference) ÷ 2 = decimal and multiple problem formula and ÷ (multiple-1) = decimal × multiple = large number (or The problem of planting trees on the non-closed line can be mainly divided into the following three situations: (1) If trees are planted at both ends of the non-closed line, Then: number of plants = number of segments+1 = total length ÷ plant spacing-1 total length = plant spacing × (number of plants-1) plant spacing = total length ÷ (number of plants-1) ⑵ If it is to be planted: number of plants. ÷ Difference between two distributions = number of shares participating in distribution (big profit-small profit) ÷ Difference between two distributions = number of shares participating in distribution (big loss-small loss) ÷ Difference between two distributions = number of shares participating in distribution formula. Encounter distance = speed and x encounter time = encounter distance ÷ the sum of speed and speed = encounter distance ÷ encounter time. The formula of catching up problem = speed difference × catching up time = catching up distance ÷ speed difference = catching up distance ÷ catching up time. Downstream problems. Hydrostatic velocity = (downstream velocity+countercurrent velocity) ÷2 Water flow velocity = (downstream velocity-countercurrent velocity) ÷2 Concentration problem formula: solute weight+solvent weight = solution weight ÷ solution weight × 100% = concentrated solution weight × concentration = solute weight ÷ concentration = solution weight; The formula of profit and discount problem: profit = selling price-cost profit rate = profit/cost × 65438. × 100% increase or decrease = principal× increase or decrease percentage discount = actual selling price ÷ original selling price× 1 00% (discount <1) interest = principal× interest rate× time after tax interest = principal× interest rate× time × (1-)