1 x number of shares per share = total number of shares ÷ number of shares = 2 1 multiple × multiple ÷ 1 multiple = multiple ÷ multiple = 1 multiple 3 speed × time = distance \ Working efficiency × working time = total workload ÷ working efficiency = working time ÷ total workload ÷ working time = working efficiency 6 addend+addend = sum-one addend = another addend 7 minuend-subtree = difference minuend-difference = subtree+subtree = minuend 8 factor × factor = product ÷. 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× side length V = A× A× side length. ×2 C=2(a+b) area = length× width S=ab 4 cuboid v: volume s: area a: length b: width h: height (1) surface area (length× width+length× height+width× height )× 2s = 2 (ab+ah+BH). Volume = length × width × height V=abh 5 triangle s area a bottom h height area = bottom x height ÷2 s=ah÷2 triangle height = area x 2 ÷ bottom triangle bottom = area x 2 ÷ height 6 parallelogram s area a bottom h height area = bottom x height s=ah 7 trapezoid s area a top bottom b bottom. × h ∏ 2 8 circular S area c perimeter ∏ d= diameter r= radius (1) perimeter = diameter× ∏ = 2× ∏× radius C=∏d=2∏r (2) area = radius× radius×. Bottom area r: bottom radius c: bottom perimeter (1) lateral area = bottom perimeter x height (2) surface area = lateral area+bottom area x 2 (3) volume = bottom area x height (4) volume = lateral area ÷ 2 x radius 10 cone v: volume h: height. Base area r: base radius volume = base area × height ÷3 Total number ÷ Total number = formula (sum+difference) ÷ 2 = large number (sum-difference) ÷ 2 = sum of decimal and multiple problems ÷ (multiple-1) = decimal × multiple. = Decimal Decimal × Multiply = Large number (or Decimal+Difference = Large number) Tree planting problem 1 Tree planting problem on the unclosed line can be mainly divided into the following three situations: (1) If trees are planted at both ends of the unclosed 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 = number of nodes-1 = ÷ 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 meets the requirements; Meeting distance = speed × meeting time = meeting distance; The sum of speed and speed = meeting distance; Meeting time; Catch up with the problem; Distance = catch up with time; Distance; Speed difference = catching distance; Catch up with time; Downstream speed = (downstream speed+countercurrent speed) ÷2 Water flow speed = (downstream speed-countercurrent speed) ÷2 Solute weight+solvent weight = solution weight ÷ solution weight × 100% = concentrated solution weight × concentration = solute weight ÷ concentration = solution weight profit and discount profit. × 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-)