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Knowledge points in the second volume of mathematics in the second day of junior high school
Knowledge points of the second volume of mathematics in the second day of junior high school of People's Education Press

Mathematics In ancient China, mathematics was called arithmetic, also called arithmetic, and was finally changed to mathematics. Mathematics is divided into two parts, one is geometry and the other is algebra. The following are the knowledge points of the second volume of the second grade mathematics of the People's Education Press. I hope everyone will read it carefully!

The first chapter scores

1 fraction and its basic properties

The numerator and denominator of a fraction are multiplied (or divided) by an algebraic expression that is not equal to zero at the same time, and the fraction is only the same.

Fractional operation of 2

Multiplication and division of (1) fraction

Law of multiplication: Fractions are multiplied by fractions, the product of molecules is the numerator of the product, and the product of denominator is the denominator of the product.

Law of division: divide a fraction by a fraction, exchange the numerator and denominator of the divisor and multiply it by the divisor.

(2) Addition and subtraction of fractions

Law of addition and subtraction: add and subtract with denominator fraction, and add and subtract molecules with denominator unchanged;

Fractions with different denominators are added and subtracted, first divided by fractions with the same denominator, and then added and subtracted.

Addition, subtraction, multiplication and division of exponential powers of three integers

4- Fractional Equation and Its Solution

Chapter II Inverse Proportional Function

Expressions, images and properties of 1 inverse proportional function

Image: hyperbola

Expression: y=k/x(k is not 0)

Nature: the increase and decrease of the two branches are the same;

2 the application of inverse proportional function in practical problems

Chapter III Pythagorean Theorem

Pythagorean Theorem of 1: The sum of squares of two right angles of a right triangle is equal to the square of the hypotenuse.

2 Pythagorean Theorem Inverse Theorem: If the sum of squares of two sides in a triangle is equal to the square of the third side, then the triangle is a right triangle.

The fourth chapter quadrilateral

1 parallelogram

Attribute: equilateral; Diagonally equal; Divide diagonally.

Judgment: two groups of quadrangles with equal opposite sides are parallelograms;

Two groups of quadrangles with equal diagonal are parallelograms;

Quadrilaterals whose diagonals bisect each other are parallelograms;

A set of quadrilaterals with parallel and equal opposite sides is a parallelogram.

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