Find all the mathematically proven formulas and theorems from the first to the third year of junior

Mathematics concepts for the first year of junior high school.

Real Numbers: — Rational and irrational numbers are collectively referred to as real numbers.

Rational Numbers: Integers and fractions are collectively referred to as rational numbers.

Irrational Numbers: Irrational numbers refer to infinite non-cyclic decimals.

Natural Numbers: The number of objects (0 inclusive) is called a natural number.

Number line: A straight line that specifies the dot, the positive direction, and the unit length is called the number axis.

Opposite number: Two numbers with different symbols are opposite to each other.

Reciprocal: Two numbers whose product is 1 are reciprocal to each other.

Absolute value: The distance between the point representing the number a and the dot on the number line is called the absolute value of a. The absolute value of a positive number is itself, the absolute value of a negative number is its opposite, and the absolute value of 0 is 0

Mathematical theorem formulas.

The rules of operation of rational numbers.

Addition rule: add two numbers with the same sign, take the same symbol, and add the absolute value; Add two numbers with different signs, take the sign of the addition with the larger absolute value, and subtract the smaller absolute value from the larger absolute value, and add the two numbers that are opposite to each other to get 0

The law of subtraction: subtracting a number is equal to adding the opposite of the number.

Multiplication rule: multiply two numbers, the same sign is positive, the different sign is negative, and multiply the absolute value; Multiplying any number by 0 gives 0

The law of division: dividing by a number is equal to multiplying the reciprocal of that number; Divide the two numbers, the same sign is positive, the different sign is negative, and divide the absolute value; 0 divided by any number that is not equal to 0 gives 0

Number of copies per copy of the total.

Total Number of copies per copy.

Total number of copies per copy.

1 multiple, multiple, several multiples.

Multiples of 1 multiple.

Multiples Multiples 1 multiple.

Speed time distance.

Distance, speed, time.

Distance, time, speed.

Unit price, quantity, total price.

Total Price, Unit Price, Quantity.

Total price, quantity, unit price.

Productivity: Working hours, Total amount of work.

Total amount of work, work efficiency, working hours.

Total work, working hours, work efficiency.

Add the number of additions and.

and one plus and the other plus.

Minus minus difference.

Subtracted Difference Subtracted.

The difference subtracted by the subtracted number.

Factor Factor product.

The product of one factor is another factor.

The dividend is the divisor quotient.

The dividend quotient is the divisor.

The quotient divisor is the dividend.

Elementary School Math Graph Calculation Formulas.

Square. c circumference.

s area. A side length.

Circumference Side length 4

c = 4a area = side length side length. s=a×a

Cube. v: volume.

A: Ridge length. Surface area = edge length Ridge length 6

S table = a a 6

Volume = edge length edge length edge length.

v=a×a×a

Rectangle. c circumference.

s area. A side length.

Circumference = (length + width) 2

c=2(a+b)

Area = length and width. s=ab

Cuboid. v: volume.

s area. A: Long. B: Wide.

H: High. Surface area (length and width + length and height + width and height) 2s = 2 (ab + ah + bh).

Volume = length, width, height. v=abh

Triangle. s area.

A bottom. H: High.

Area = base height 2

s=ah÷2

Triangle height = area.

2 bottoms. Triangle base = area. 2 high.

Parallelogram.

s area. A bottom.

H: High. Area = base height. s=ah

Trapezium. s area.

A top bottom. b bottom.

H: High. Area = (top bottom + bottom bottom) height 2

s=(a+b)×h÷2

Rotundity. s area.

c circumference. d = diameter.

r=radius. Circumference = Diameter = 2 Radius.

c=∏d=2∏r

Area = Radius Radius

Cylinder. v: volume.

H: High. s;Base area.

r: Radius of the bottom surface.

c: Bottom circumference.

Side area = bottom perimeter height.

Surface Area = Side Area + Base Area 2

Volume = Base Area High Multiplied Volume Side Area 2 Radius.

Cone. v: volume.

H: High. s;Base area.

r: Radius of the bottom surface.

Volume = Base area height 3

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