Shanghai science edition eighth grade mathematics textbook catalogue
Chapter 16 Quadratic Radicals
16. 1 quadratic radical
Operation of 16.2 Quadratic Radical
Chapter 17 One-variable quadratic equation
17. 1 unary quadratic equation
17.2 the solution of quadratic equation in one variable
17.3 discriminant formula for roots of quadratic equation in one variable
17.4 the relationship between roots and coefficients of a quadratic equation with one variable
Application of 17.5 one-dimensional quadratic equation
Chapter 18 Pythagorean Theorem
18. 1 Pythagorean theorem
Inverse Theorem of Pythagorean Theorem 18.2
Chapter 19 quadrilateral
19. 1 sum of interior angles of polygons
19.2 parallelogram
19.3 Rectangular rhombic square
19.4 centrosymmetric graph
19.5 trapezoid
Chapter 20 Preliminary Analysis of Data
20. 1 Frequency distribution of data
20.2 Concentration trend and dispersion degree of data
20.3 Comprehensive and Practical Body Mass Index
Lu Ke version of the eighth grade mathematics knowledge points: addition and subtraction of quadratic roots
1 similar quadratic radical
Generally speaking, after several quadratic roots are transformed into the simplest quadratic roots, if their roots are the same, they are called similar quadratic roots.
2 Merge similar secondary roots
Merging several similar quadratic roots into one quadratic root is called merging similar quadratic roots.
3 When adding or subtracting secondary roots, you can first convert the secondary roots into the simplest secondary roots, and then merge the roots with the same number.
Mixed operation of quadratic roots
1 determines the operation sequence.
2 Flexible use of operating rules
3 the correct use of multiplication formula
Most denominators should be rational and timely.