Length unit conversion 1 km = 1 000m1m = 1 decimeter1decimeter = 1 0cm/cm hectare = 10000. 00 square decimeter 600kg 1 kg = 1000g 1 kg RMB unit conversion 1 yuan = 10 angle/kloc-0 angle =10 minute10. Yes:1\ 3 \ 5 \ 7 \ 8 \10 \ 65438+abortion in February (30 days): 4 \ 6 \ 9 \ 65438. Leap year 366 days 1 day =24 hours 1 hour =60 minutes 1 minute =60 seconds 1 hour =3600 seconds × number of copies = total number of copies ÷ each copy = total number of copies ÷ number of copies =2 copies, 1 multiple×××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××× Cube v: volume a: surface area of side length = side length × side length× ×6 S table =a×a×6 volume = side length× side length V = A×A×A×A 3, rectangle c perimeter s area a side length perimeter = (length+width )× 2 c = 2 (a+b) area = length× width s. 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 x h ∏ 28 circular s area c circumference ∏. 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 × (1-20/-)