What is the definition rule of the three elements of function in mathematics of senior one? (what is f in function sign Y = f (x))

What is the definition rule of the three elements of function in mathematics of senior one? (what is f in function sign Y = f (x))

F is the corresponding rule. In every function, the corresponding rule is different. For example, f (x) = X-1, the corresponding rule is the independent variable minus 1

Three elements of function
Of the three elements (), two functions are different
The two functions of () in the three elements are the same function

Of the three elements (any one is different), two functions are different
The two functions of the three elements are the same

What is the corresponding relationship among the three elements in the function? There are some examples

Three elements of function: domain of definition, range of value and correspondence rule
The simple understanding of the corresponding law is the analytic formula~
The most important is the domain of definition and the corresponding rule. The range of value is determined by the domain of definition and the corresponding rule. A function is the same if and only if the domain of definition and the corresponding rule are the same

The sum of a prime number and any other prime number is odd. I am ()

The sum of a prime number and any other prime number is odd
Because any even number, except 2, has at least 1, itself and 2,
So all prime numbers except 2 are odd,
Even and odd add to get odd
So the answer is two

If x = - 3, y = 2, then a + B =?

2x-by=1 x=-3 y=2
-6-2b=1 b=-3.5
ax+by=4 -3a-7=4 a=-11/3
a+b=-43/6

It is known that x = - 2, y = 3 is the solution of binary linear equations ax-3y = 5 2x + by = 2, and the value of A-B is

It is known that x = - 2, y = 3 are the solutions of binary linear equations ax-3y = 52X + by = 2
We can substitute X and Y into - 2a-9 = 5 - 4 + 3B = 2
A = - 7, B = 2
So A-B = - 9

Natural number solutions of bivariate linear equation 2x + 1 / 2Y = 3

The original equation can be reduced to 4x + y = 6
y＝6－4x≥0
x≤1.5
∴x＝0,y＝6
x＝1,y＝2

Binary linear equation 2x-5y = - 3 {- 4x + y = - 3

From the second equation, y = 4x-3 is obtained. Substituting this equation into the first equation, 2x-5 (4x-3) = - 3 is obtained. Solving this equation, x = 1 is obtained. Substituting x = 1 into the second equation, y = 1 is obtained
{x=1,y=1}

Finding the quadratic equation 2x-5y = 7,2x + 3Y = - 1

2X-5Y=7 ①
2X+3Y=-1 ②
① - 8y = 8
y = -1
Y = - 1 into 1
2x +5 =7
x =1

Is 2x = 5Y a quadratic equation of two variables

Yes