1, monomial: The product of numbers and letters is called monomial.

2. Polynomial: The sum of several monomials is called polynomial.

3. Algebraic expressions: monomials and polynomials are collectively referred to as algebraic expressions.

4. The number of monomials: The sum of the indices of all the letters in the monomials is called the number of monomials.

5. Degree of Polynomial: The degree of the term with the highest degree in the polynomial is the degree of the polynomial.

6. Complementary angle: The sum of two angles is 90 degrees, and these two angles are called complementary angles.

7. Complementary angle: The sum of two angles is 180 degrees, and these two angles are called complementary angles.

8. Relative vertex angles: two corners have a common vertex, and two sides of one corner are opposite to the extension lines of two sides of the other corner. These two angles are antipodal angles.

9. Common angle: In the "three-line octagon", the angles at the same position are common angles.

10, internal angle: in the "three-line octagon", the angle sandwiched between two straight lines is the internal angle.

1 1, ipsilateral inner angle: in "trilinear octagon", the angle on the same side of trilinear is ipsilateral inner angle.

12, significant number: an approximation, starting with the first number on the left that is not 0 and ending with the exact 1, all numbers are significant numbers.

13, probability: the probability of an event is the probability of this event.

14, triangle: A figure composed of three line segments that are not on the same line is called a triangle.

15, Angle bisector of triangle: In a triangle, the angle bisector of an inner angle intersects its opposite side, and the line segment between the intersection of the vertex and this angle is called the angle bisector of triangle.

16, triangle midline: the line segment connecting the vertex and the midpoint of the opposite side of the triangle is called the midline of the triangle.

17. Height line of triangle: Draw a vertical line from one vertex of triangle to the line where its opposite side is located, and the line segment between vertex and vertical foot is called height line of triangle.

18, congruent graphics: two graphics that can overlap are called congruent graphics.

19, variable: the number of changes is called variable.

20. Independent variable: If there is an active change in the amount of change, it is called an independent variable.

2 1, dependent variable: the quantity that changes passively with the change of independent variables is called dependent variable.

22. Axisymmetric figure: If a figure is folded along a straight line and the parts on both sides of the straight line can overlap each other, then this figure is called an axisymmetric figure.

23. Symmetry axis: A straight line folded in half in an axisymmetric figure is called symmetry axis.

24. perpendicular bisector: The line segment is an axisymmetric figure, and its symmetry axis is perpendicular to this line segment and divides it into two parts. Such a straight line is called the midline of this line segment. (refers to the middle vertical line)

Second, computing power.

(a) Calculation of algebraic expressions.

1, addition and subtraction of algebraic expressions

Remove brackets and merge similar items!

2. Power operation (seven formulas)

① Power with the same base: the base is constant, and the exponents are added. (2) Power of power: the base number is unchanged, multiplied by the index.

③ Power of product: equal to the product of the power of each element. (4) Multiply with exponential power: the exponent is constant and the base is multiplied.