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Taigu No.3 Middle School Entrance Examination (20 10)
Review by yourself. This is the formula of primary school, and see what won't.

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%)