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 hours = total workload ÷ working efficiency = working hours ÷ total workload ÷ working hours = working efficiency 6 addend+addend = sum-one addend = another addend 7 is reduced-subtraction = 1 1 square c perimeter s area a side length perimeter = side length × 4C = 4A area. 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) ×2 S=2(ab+ah+bh) (2) 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 x h ÷ 28 circle s area c circumference ∏ d 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. Tree planting problem 1 tree planting problem on unclosed line can be divided into the following three situations: (1) If trees are to be planted at both ends of unclosed line, then: number of plants = number of segments+1 = total length ÷ plant spacing-1 = total length = plant spacing × (number of plants- Then: number of plants = number of nodes = total length ÷ plant spacing = plant spacing × number of plants = total length ÷ number of plants (3) If trees are not planted at both ends of the non-closed line, then: number of plants = number of nodes-1 = total length ÷ plant spacing-1 total length = plant spacing. 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-)