Key knowledge of linear function in junior two mathematics
Key knowledge of mathematical linear function in grade two (1) 1. Define and define the formula: the independent variable X and the dependent variable Y have the following relationship: y=kx+b, then Y is said to be a linear function of X at this time. In particular, when b=0, y is a proportional function of x.
That is, y=kx (k is a constant, k0). Second, the nature of the linear function: the change value of 1.y is directly proportional to the change value of x, and the ratio is k, that is, y = kx+b (where k is any non-zero real number b, take any real number). Second, when x=0, b is the intercept of the function on the y axis.
Important knowledge points of mathematical real numbers
Definition: Any finite decimal or infinite cyclic decimal is a rational number. Infinitely cyclic decimals are called irrational numbers (rational numbers can always be expressed by finite decimals or infinitely cyclic decimals).
Generally speaking, if the square of a positive number X is equal to A, then this positive number X is called the arithmetic square root of A. In particular, we stipulate that the arithmetic square root of 0 is 0.
Generally speaking, if the square of a number x is equal to a, then this number x is called the square root of a (also called quadratic square root), and a positive number has two square roots; 0 has only one square root, which is 0 itself; Negative numbers have no square root. The operation of finding the square root of a number is called square root, where a is called square root.
Generally speaking, if the cube of a number X is equal to A, then this number X is called the cube root of A (also called cube root). The cube root of a positive number is a positive number; The cube root of 0 is 0; The cube root of a negative number is a negative number. The operation of finding the cube root of a number is called square root, where a is called square root. Rational numbers and irrational numbers are collectively called real numbers, that is, real numbers can be divided into rational numbers and irrational numbers.
The Formula of Solving Definition Domain in Junior Two Mathematics
Four principles should be paid attention to when seeking the domain.
Negative numbers cannot be squared, and zero denominator is meaningless.
Refers to the positive number at the bottom of the score, and there is no time to count zero.
Constraints are not unique and satisfy multiple inequalities.
Four principles should be paid attention to when obtaining the domain through customs clearance.
Negative numbers cannot be squared, and zero denominator is meaningless.
The bottom of the score index is positive, and there is no zero when the count is zero.
Constraints are not unique, solve the inequality group.
The above are the knowledge points I summarized for you, which are for reference only. I hope it will help you.