The Complete Works of Mathematical Formulas in Primary Schools, Part III: Geometry.

1, squared

Perimeter of a square = side length? 4 formula: C=4a

Area of a square = side length? Side length formula: S=a? a

Volume of cube = side length? Side length? Side length formula: V=a? Answer? a

2. Rectangular

The circumference of a rectangle = (length+width)? 2 formula: C=(a+b)? 2

Area of rectangle = length? Wide formula: S=a? b

Volume of cuboid = length? Wide? High formula: V=a? b？ h

Step 3: Triangle

Area of triangle = bottom? Tall? 2. formula: S= a? h？ 2

4. Parallelogram

Area of parallelogram = bottom? High formula: S= a? h

5, trapezoidal

Area of trapezoid = (upper bottom+lower bottom)? Tall? 2 formula: S=(a+b)h? 2

6. circle

Diameter = radius? 2 formula: d=2r

Radius = diameter? 2 formula: r= d? 2

Circumference = pi? Diameter formula: c=? d =2？ r

Area of circle = radius? Radius formula: S=? Resistance ratio

7. Cylinder

Side area of cylinder = perimeter of bottom surface? Tall man. Formula: S=ch=? dh=2？ right hand

Surface area of cylinder = perimeter of bottom surface? Height+area of both ends of the circle. Formula: S=ch+2s=ch+2? r2

Total volume of cylinder = bottom area? Tall man. Formula: V=Sh

8. Cone

Total volume of cone = bottom area? Tall? 1/3 formula: V= 1/3Sh.

The sum of the internal angles of the triangle = 180 degrees.

Parallel lines: Two straight lines that do not intersect the same plane are called parallel lines.

Vertical: two straight lines intersect at right angles, and two straight lines are like this.

Suppose these two straight lines are perpendicular to each other, one of which is called the perpendicular of the other, and the intersection of these two straight lines is called the vertical foot.

The complete set of primary school mathematical formulas, Part IV: Calculation formulas.

1, per share? Number of copies = total? Number of copies = total number of copies? Number of copies = number of copies

Multiply of 2.65438 +0? Multiple = multiple, multiple? 1 multiple = multiple What multiple? Multiplication = 1 multiplication

3. speed Time = distance? Speed = time distance? Time = speed

4. Unit price? Quantity = total price? Unit price = total quantity price? Quantity = unit price

5. Work efficiency? Working hours = total work? Work efficiency = the total amount of work during working hours? Working hours = working efficiency

6. Appendix+Appendix = sum, and-one addend = another addend.

7. Minus-Minus = Minus-Minus = Minus+Minus = Minus

8. Factor? Factor = product product? One factor = another factor

9. Dividends? Divider = business dividend? Quotient = divisor quotient? Divider = dividend

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(sum+difference)? 2= large quantity

(sum and difference)? 2= decimal

And folding problems.

And then what? (multiple-1)= decimal

Decimal? Multiple = large number

(or sum-decimal = large number)

Difference problem

Poor? (multiple-1)= decimal

Decimal? Multiple = large number

(or decimal+difference = large number)

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1. The problem of planting trees on unclosed lines can be mainly 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? Plant spacing-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 nodes = total length? vertical spacing

Total length = plant spacing? Plant quantity

Plant spacing = total length? Plant quantity

(3) If no trees are planted at both ends of the non-closed line, then:

Number of plants = number of nodes-1= full length? Plant spacing-1

Total length = plant spacing? (number of plants+1)

Plant spacing = total length? (number of plants+1)

2. The quantitative relationship of planting trees on the closed line is as follows

Number of plants = number of nodes = total length? vertical spacing

Total length = plant spacing? Plant quantity

Plant spacing = total length? Plant quantity

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(profit+loss)? Difference between two distributions = number of copies participating in the distribution

(Daying-Xiaoying)? Difference between two distributions = number of copies participating in the distribution

(big loss-small loss)? Difference between two distributions = number of copies participating in the distribution

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Meeting distance = speed and? Meeting time

Meeting time = meeting distance? Speed sum

Speed sum = meeting distance? Meeting time

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Chasing distance = speed difference? Catch up with time

Catch-up time = catch-up distance? speed difference

Speed difference = catching distance? Catch up with time

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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

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Solute weight+solvent weight = solution weight.

The weight of solute? The weight of the solution? 100%= concentration

The weight of the solution? Concentration = weight of solute

The weight of solute? Concentration = solution weight

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Profit = selling price-cost

Profit rate = profit? Cost? 100%= (price? Cost-1)? 100%

Upper and lower amount = principal? Percentage of increase and decrease

Discount = actual selling price? Original price? 100% (discount < 1)

Interest = principal? Interest rate? time

Interest after tax = principal? Interest rate? Time? ( 1-20%)

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(1)1km =1km =1000m1m =10 decimeter1decimeter =10 cm/kloc.

(2) 1 m2 = 100 square decimeter 1 square decimeter = 100 square centimeter 1 square centimeter = 100 square millimeter.

(3) 1 m3 = 1000 cubic decimeter 1 cubic decimeter = 1000 cubic centimeter 1 cubic centimeter = 1000 cubic millimeter.

(4) 1 hectare = 1 ten thousand square meters 1 mu =666.666 square meters.

(5) 1 liter = 1 cubic decimeter = 1000 ml 1 ml = 1 cubic centimeter.

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1 ton = 1000 kg

1 kg =1000g

1 kg = 1 kg

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1 yuan = 10 angle.

1 angle = 10 point

1 yuan = 100 integral.

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1 century = 100 1 year =65438+ February.

The big month (3 1 day) is: 13578 1065438+ February.

Abortion (30 days) includes: 469 1 1 month.

February 28th in a normal year and February 29th in a leap year.

There are 365 days in a normal year and 366 days in a leap year.

1 day =24 hours 1 hour =60 minutes.

1 minute =60 seconds 1 hour =3600 seconds.

Daquan Theorem of Mathematical Formulas in Primary Schools

Part II: Definition Theorem (Arithmetic)

1, additive commutative law: Two numbers are added to exchange the position of addend, and the sum is unchanged.

2. Law of additive combination: When three numbers are added, the first two numbers are added first, or the last two numbers are added first, and then the third number is added, and the sum remains unchanged.

3. Multiplication and exchange law: when two numbers are multiplied, the position of the exchange factor remains unchanged.

4. Multiplication and association law: When three numbers are multiplied, the first two numbers are multiplied, or the last two numbers are multiplied first and then the third number, and their products are unchanged.

5. Multiplication and distribution law: When two numbers are multiplied by the same number, you can multiply the two addends by this number respectively, and then add the two products, and the result remains unchanged. Such as: (2+4)? 5=2? 5+4? 5.

6. Nature of division: In division, the dividend and divisor are expanded (or reduced) by the same multiple at the same time, and the quotient remains unchanged. Divide 0 by any number other than 0 to get 0.

7. Equation: An equation in which the value on the left of the equal sign equals the value on the right of the equal sign is called an equation.

Basic properties of the equation: When both sides of the equation are multiplied (or divided) by the same number at the same time, the equation is still valid.

8. Equations: Equations with unknowns are called equations.

9. One-dimensional linear equation: An equation with an unknown number of 1 is called a one-dimensional linear equation.

Example method and calculation of learning linear equation of one variable. Are there any examples? Formulas and calculations.

10, score: in units? 1? Divide into several parts on average, and the number representing such a part or a few points is called a score.

1 1, addition and subtraction of fractions: add and subtract fractions with denominator, only add and subtract numerators, and the denominator remains unchanged. Fractions of different denominators are added and subtracted, first divided, then added and subtracted.

12. Comparison of fractional sizes: Compared with the denominator, the numerator is large and the numerator is small.

Compare the scores of different denominators, divide them first and then compare them; If the numerator is the same, the denominator is big and small.

13, the fraction is multiplied by the integer, and the product of the multiplication of the fraction and the integer is the numerator, and the denominator remains unchanged.

14. Fractions are multiplied by fractions, the product of numerator multiplication is numerator, and the product of denominator multiplication is denominator.

15, the fraction divided by an integer (except 0) is equal to the fraction multiplied by the reciprocal of this integer.

16, true fraction: the fraction with numerator less than denominator is called true fraction.

17. False fraction: the fraction with numerator greater than denominator or numerator equal to denominator is called false fraction. False score is greater than or equal to 1.

18, with fraction: write the false fraction as an integer, and the true fraction is called with fraction.

19, the basic nature of the fraction: the numerator and denominator of the fraction are multiplied or divided by the same number at the same time (except 0), and the size of the fraction remains unchanged.

20. A number divided by a fraction is equal to the number multiplied by the reciprocal of the fraction.

2 1, the number A divided by the number B (except 0) is equal to the reciprocal of the number A multiplied by the number B. ..