Then make up for it
Believe in yourself without looking for a paper.
Formula set
General operating rules
65438+ 0× number of shares per share = total number of shares = total number of shares = number of shares = number of shares.
2 1 multiple× multiple = multiple1multiple = multiple/multiple = 1 multiple
3 speed × time = distance distance ÷ speed = time distance ÷ time = speed
4 unit price × quantity = total price/total price = total quantity/quantity = unit price
5 working efficiency × working time = total workload ÷ working efficiency = working time ÷ total workload ÷ working time = working efficiency
6 addend+addend = and-one addend = another addend.
7 minuend-minuend = difference minuend-difference = minuend difference+minuend = minuend
8 factor × factor = product product ÷ one factor = another factor
9 Dividend Divider = quotient divisor = divisor quotient × divisor = dividend
Calculation formula of mathematical graphics in primary schools
1 square c perimeter s area a side length
Perimeter = side length ×4 C=4a
Area = side length × side length S=a×a
2 cubic v: volume a: side length
Surface area = side length × side length× 6 s Table =a×a×6
Volume = side length × side length × side length v = a× a× a.
3 rectangle c perimeter s area a side length
Circumference = (length+width) ×2 C=2(a+b)
Area = length × width S=ab
4 cuboid v: volume s: area a: length b: width h: height
Surface area (length× width+length× height+width× height )× 2s = 2 (AB+AH+BH)
Volume = length× width× height V=abh
5 triangle s area a base h height
Area = bottom × height ÷2 s=ah÷2
Height of triangle = area ×2÷ base of triangle = area ×2÷ height
6 parallelogram s area a bottom h height
Area = bottom × height s=ah
7 trapezoid s area a upper bottom b lower bottom h height
Area = (upper bottom+lower bottom) × height ÷2 s=(a+b)× h÷2.
8 circle s area c perimeter ∏ d= diameter r= radius
Circumference = diameter x ∏ = 2 x ∏× radius C=∏d=2∏r
Area = radius × radius ×∈
9 cylinder v: volume h: height s; Bottom area r: bottom radius c: bottom perimeter
Lateral area = perimeter of bottom× high surface area = lateral area+area of bottom× 2.
Volume = bottom area × high volume = lateral area ÷2× radius.
10 cone v: volume h: height s; Bottom area r: bottom radius
Volume = bottom area × height ÷3
Primary school olympiad formula
Formula of sum and difference problem
(sum+difference) ÷ 2 = large number (sum-difference) ÷ 2 = decimal.
Summation formula and multiple problems
Sum ÷ (multiple-1) = decimal × multiple = large number (or sum-decimal = large number)
Formula of differential multiple problems
Difference ÷ (multiple-1) = decimal × multiple = large number (or decimal+difference = large number)
Tree planting formula
1 The problem of planting trees on unclosed lines can be 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 nodes+1 = total length-1.
Total length = plant spacing × (number of plants-1)
Plant spacing = total length ÷ (number of plants-1)
2 If you want to plant trees at one end of the unclosed line and not at the other end, then:
Number of plants = number of segments = total length ÷ plant spacing
Total length = plant spacing × number of plants
Plant spacing = total length/number of plants
(3) If no trees are planted at both ends of the non-closed line, then:
Number of plants = number of nodes-1 = total length-1.
Total length = plant spacing × (number of plants+1)
Plant spacing = total length ÷ (number of plants+1)
The quantitative relationship of planting trees on the closed line is as follows
Number of plants = number of segments = total length ÷ plant spacing
Total length = plant spacing × number of plants
Plant spacing = total length/number of plants
Formula of profit and loss problem
(Profit+Loss) ÷ 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) ÷ The difference between two distributions = the number of shares participating in the distribution.
The formula of encounter problem
Meeting distance = speed × meeting time
Meeting time = meeting distance/speed and
Speed Sum = Meeting Distance/Meeting Time
The formula for tracing the problem
Catch-up distance = speed difference× catch-up time
Catch-up time = catch-up distance ÷ speed difference
Speed difference = catching distance ÷ catching time
Tap water problem
Downstream velocity = still water velocity+current velocity
Countercurrent velocity = still water velocity-current velocity
Still water velocity = (downstream velocity+countercurrent velocity) ÷2
Water velocity = (downstream velocity-countercurrent velocity) ÷2
Formula of concentration problem
Solute weight+solvent weight = solution weight.
The weight of solute/solution × 100% = concentration.
Solution weight × concentration = solute weight
Solute weight-concentration = solution weight.
Profit formula and discount problem
Profit = selling price-cost
Profit rate = profit/cost × 100% = (selling price/cost-1) × 100%.
Up and down amount = principal × up and down 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%)