"One-time Function" PPT download

Description

"One-time Function" PPT download

Part One: Use your brain

What kind of function can be used to express the corresponding rules of variables in the following questions?

(1) The circumference L of the circle changes with the change of the radius r;

L=2πr

(2) The density of iron is 7.8g/cm, and the mass m (unit g) of the iron block changes with its volume V (unit cm);

m=7.8V

(3) The thickness of each exercise book is 0.5cm. The total thickness h (unit cm) of some exercise books stacked together changes with the change of the number n of these exercise books;

h=0.5n

(4) Freeze a 0℃ object so that it drops by 2℃ every minute. The temperature T (unit: ℃) of the object changes with the freezing time t (unit: minutes).

T=-2t

One-time function PPT, the second part: induction

Generally, a function of the form y=kx (k is a constant, k≠0) is called a proportional function, where k is called the proportional coefficient.

Why is it emphasized here that k is a constant, k≠0?

(1) Can you give some examples of proportional functions?

(2) Which of the following functions are proportional functions?

One-time function PPT, the third part: Comprehensive application training

1. Which of the two quantities in the following relationship is directly proportional to ( )

A． The time and speed from place A to place B; B. Area and side length of square

C. The amount of money required to buy the same exercise books and the number of exercise books; D. People's weight and height

2. Among the following functions, y is a proportional function of x ( )

A． y=4x+1 B. y=2x2 C. y=-√5x D. y=√x

3. Which of the following statements is not true ( )

A． In y=3x-1, y+1 is directly proportional to x; B. In y=-7x, y is directly proportional to x

C. In y=2(x+1) y is directly proportional to x+1; D in y=x+3 y is directly proportional to x

4. Function y=(2m+6)x2+(1-m)x is a proportional function, then the value of m is ( )

A． m=-3 B. m=1 C. m=3 D. m>-3

Keywords: Free download of Hebei Education Edition mathematics PPT courseware for eighth grade volume 2, one-time function PPT download, .PPT format;

For more information about the PPT courseware "Linear Function", please click the "Linear Function ppt" tab.

"The relationship between linear functions and linear equations of two variables" PPT courseware:

"The relationship between linear functions and linear equations of two variables" PPT courseware Part One: Problem Exploration Question 1: How many solutions are there to the linear equation of two variables y-x=1? Please give an example. (For example: x=-2,y=-1; x=-1,y=0; x=0,y=1; x=1,y=2; Therefore, the equation y-x=1 has...

"The relationship between linear functions and linear equations of two variables" PPT:

"The relationship between linear functions and linear equations of two variables" PPT Part 1 content: Knowledge preparation 1. What is the general form of a linear function? How to find the analytical expression of a linear function? 2. What are the characteristics of the graph of a linear function? How to draw the graph of a linear function? ... ... ...

Download the PPT courseware of "Application of a linear function":

"Application of linear functions" PPT courseware download Part 1: Warm-up exercises 1. A car is driving from Nanjing to Shanghai, which is 300 kilometers away. When its average speed is 100 kilometers/hour, which graph below represents the distance s (kilometers) and the driving time t of the car from Shanghai..

File Info

Update Time: 2024-09-08

This template belongs to Mathematics courseware Hebei Education Edition Eighth Grade Mathematics Volume 2 industry PPT template

Preview