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 × height ÷2 s=ah÷2 triangle height = area × 2 ÷ bottom triangle bottom = area × 2 ÷× h ∏ 2 8 circle s area c circumference ∏ d= diameter r= 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. Bottom area r: the formula of the sum and difference problem of bottom radius volume = bottom area × height ÷ 3; Total number ÷ Total number of copies = average (sum+difference) ÷ 2 = large number (sum-difference) ÷ 2 = decimal and multiple problem and ÷ (multiple-1) = decimal x multiple = large number (or sum-decimal = large number) difference problem ÷. 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. Capital-1) × 100% increase or decrease = principal × increase or decrease percentage discount = actual selling price ÷ original selling price × 100% (discount < 1) interest = principal × interest rate × time after tax interest = principal × interest rate × time.