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The letters of all formulas in the second book of sixth grade mathematics should also be used.
A complete collection of mathematical formulas in primary schools

First, the perimeter of primary school mathematical geometry

zone

Volume calculation formula

Perimeter of rectangle

=

(Dragon

+

Wide)

×

2 C =(a+b)× 1

2

The circumference of a square

=

Length of side

×

4 C=4a

Rectangular area

=

long

×

extensive

S=ab

Area of a square

=

Length of side

×

Length of side

a= a

Area of triangle

=

bottom

×

high

÷

2 S=ah

2

Area of parallelogram

=

bottom

×

high

S = ah

Trapezoidal area

=

(Upper bottom)

+

Bottom)

×

high

÷

2 seconds =

(

a

+

b

)

2

diameter

=

radius

×

2 d=2r

radius

=

diameter

÷

2 r= d

2

perimeter of a circle

=

circumference ratio

×

diameter

=

circumference ratio

×

radius

×2 c=πd =2πr

Area of a circle

=

circumference ratio

×

radius

×

radius

Area of triangle = base

×

high

÷

2

formula

S= a×

2

Area of a square = side length

×

Length of side

formula

S= a×

a

Area of rectangle = length

×

extensive

formula

S= a×

b

Area of parallelogram = base

×

high

formula

S= a×

h

Area of trapezoid = (upper bottom

+

Bottom)

×

high

÷

2

formula

S=(a+b)h

2

Sum of internal angles: sum of internal angles of triangle =

180

Degree.

Volume of cuboid = length

×

extensive

×

high

Formula:

V=abh

Volume of cuboid (or cube) = bottom area

×

high

Formula:

V=abh

Volume of cube = side length

×

edge

×

edge

Formula:

V=aaa

Circumference = diameter

×π

Formula:

L

=

πd

=

2πr

Area of circle = radius

×

radius

×π

Formula:

S

=

Pi?

r2

Surface (side) area of cylinder: The surface (side) area of cylinder is equal to the perimeter of bottom multiplied by height. Formula:

S=ch=πdh

=

2πrh

Surface area of cylinder: the surface area of cylinder is equal to the perimeter of the bottom multiplied by the height plus the area of the circles at both ends.

Formula:

S=ch+2s=ch+2πr2

Volume of cylinder: the volume of cylinder is equal to the bottom area multiplied by the height. Formula:

V=Sh

The volume of the cone =

1/3

the seamy side

×

Cumulative height formula:

V= 1/3Sh

Fractions add up,

Reduction rules:

Add and subtract fractions with the same denominator,

Only add and subtract molecules,

The denominator remains the same.

Fractions of different denominators are added and subtracted,

Go too far first,

Then add and subtract.

The multiplication of fractions is: use the product of molecules as numerator and the product of denominator as denominator.

The law of division of fractions: dividing by a number is equal to multiplying the reciprocal of this number.

Second, the unit conversion

(

1

)

1

Kilometers =

1

kilometre (km)

1

Kilometer =

1000

rice

1

M =

10

decimetre

1

Decimeter =

10

centimetre

1

Cm =

10

millimetre

(

2

)

1

Square meters =

100

Square DM

1

Square decimeter =

100

Square centimeter

1

Square centimeter =

100

square millimeter

(

three

)

1

Cubic meters =

1000

cubic decimeter

1

Cubic decimeter =

1000

cubic centimeter

1

Cubic centimeter =

1000

cubic millimeter

(

four

)

1

Ton =

1000

kilogram

1

kilogram

= 1000

Scold or fight?

= 1

kilogram

= 2

gold

(

five

)

1

Hectares =

10000

square meter

1

Mu =

666.666

square meter

(

six

)

1

L =

1

Cubic decimeter =

1000

millilitre

1

ML =

1

cubic centimeter

(

seven

)

1

Yuan dynasty (1206- 1368)

= 10

corner

1

corner

= 10

minute

1

Yuan dynasty (1206- 1368)

= 100

minute

(

eight

)

1

hundred years

= 100

year

1

year

= 12

moon

A bigger month

(3 1

sky

)

have

: 1\3\5\7\8\ 10\ 12

moon

The 29-day month of the lunar calendar

(30

sky

)

Yes

:4\6\9\ 1 1

moon

Average year (as opposed to leap year)

2

moon

28

sky

,

leap year

2

moon

29

sky

Average year and whole year

365

sky

,

leap year

366

sky

1

sun

=24

hour

1

time

=60

minute

1

minute

=60

second

1

time

=3600

second

Third, the calculation formula of quantitative relationship

1

, per share

×

Number of copies = total number

total

÷

Number of copies = total number of copies

÷

Number of copies = number of copies

2

1

multiple

×

Multiple = multiple

several times

÷

1

Multiple = multiple. How many times?

÷

Multiplication =

1

multiple

three

, speed

×

Time = distance

Travel distance

÷

Speed = time

Travel distance

÷

Time = speed

four

unit price

×

Quantity = total price

total

÷

Unit price = quantity

total

÷

Quantity = unit price

five

, work efficiency

×

Working hours = total amount of work

Total workload

÷

Work efficiency = the total amount of work during working hours

÷

Working hours = working efficiency

six

Appendix+Appendix = Sum

And-one addend = another addend

seven

, minuend-minuend = difference

Negative difference = negative

Difference+Minus = Minus

eight

, factor

×

Factor = product

gather

÷

One factor = another factor

nine

dividend

÷

Divider = quotient

bonus

÷

Quotient = divisor

business

×

Divider = dividend

Fourth, arithmetic.

1

Additive commutative law: Two numbers are added to exchange the position of the addend, and the sum remains the same.

2

Law of addition and combination: when adding three numbers, add the first two numbers, or add the last two numbers first, and then be the same as the first number.

Three numbers add up, and the sum remains the same.

three

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

four

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 is multiplied.

The product remains unchanged.

five

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 to form a knot.

The fruit remains the same. For example:

(

2+4

)

×

five

=

5+4×

five

six

The essence 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.

Separated by anything that is not.

You must have all the figures.

seven

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. The basic property of the equation: both sides of the equation are multiplied at the same time

Divided by the same number, this equation still holds.

eight

Equation: An equation with an unknown number is called an equation.

nine

One-dimensional linear equation: contains an unknown number and the number of times of the unknown number.

One of the equations whose number is once is called a linear equation with one variable.

Example method and calculation of learning linear equation of one variable. There are examples.

χ

Formulas and calculations.

10

Score: put the unit

" 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 the same denominator, only add and subtract numerators, and the denominator remains the same. Fractions of different denominators are added, subtracted and added first.

Divide, then add and subtract.

12

Comparison of fraction size: Compared with the fraction of denominator, the numerator is large and the numerator is small. First, compare and divide the scores of different denominators.

Then compare; If the numerator is the same, the denominator is big and small.

13

Fraction multiplied by integer, numerator is the product of fractional and integer multiplication, 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

. Fraction divided by integer (

Except)

, equal to the fraction times the reciprocal of this integer.

16

True fraction: The fraction with numerator less than denominator is called true fraction.

17

False fraction: Fractions with numerator greater than denominator or numerator equal to denominator are called false fractions. Error score greater than or equal to

1

18

Using fraction: writing a false fraction in the form of integer and true fraction is called using fraction.

19

The basic nature of a fraction: the numerator and denominator of a fraction are multiplied or divided by the same number at the same time (

Except)

, the size of the score remains unchanged.

20

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

2 1

. A number divided by b number (

Except)

, equal to the reciprocal of a multiplied by b.

Verb (abbreviation of verb) special problems

Formula of sum and difference problem

(

Sum+difference

)

÷

2

= large number

(

And poor

)

÷

2

= Decimal

And folding problems.

Heao

(

Multiple-

1)

= Decimal

Decimal × multiple = large number

(

or

Sum-Decimal = large number

)

Difference problem

Chaao

(

Multiple-

1)

= Decimal

Decimal × multiple = large number

(

or

Decimal+difference = large number

)

Tree planting problem