"Function" One-time function PPT download

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"Function" One-time function PPT download

Part One Content: Basic Knowledge Key Points

Knowledge point 1: The concept of function and the representation method of function

1. There is no functional relationship between the following two variables (D)

A. Area S and radius r of the circle

B. The temperature T and time t of a certain place on a day

C. The height y of a student in a certain class and the student’s student number x

D. The square root a of a positive number b and the positive number b

2. (Textbook Motif Variation) The following table reflects the relationship between the electricity consumption x (kWh) and the electricity fee payable y (yuan) in a certain area. The following statement is incorrect (D)

A.x and y are both variables, and x is an independent variable and y is a function of x

B. For every 1 kilowatt-hour increase in electricity consumption, the electricity bill will increase by 0.55 yuan.

C. If the electricity consumption is 8 kilowatt hours, you should pay an electricity fee of 4.4 yuan.

D.y is not a function of x

3. (Adaptation) As shown in the figure, it can be expressed that y is a function of x (D)

Function PPT, part 2: improvement of comprehensive capabilities

6. As shown in the picture, Zhang Qiang ran from home to the stadium. After exercising there for a while, he went to a breakfast shop for breakfast, and then took a walk home. Where x represents the time and y represents the distance between Zhang Qiang and his home. According to the image provided Information, which of the following statements is wrong (C)

A. The stadium is 2.5 kilometers away from Zhang Qiang’s home

B. Zhang Qiang exercised in the stadium for 15 minutes

C. The stadium is 4 kilometers away from the breakfast shop

D. Zhang Qiang’s average speed home from the breakfast shop is 3 kilometers/hour

Function PPT, the third part: expansion, exploration and breakthrough

9. In an experiment, Xiaoqiang fixed the upper end of a spring and suspended an object from its lower end. The following table shows several sets of corresponding values ​​of the measured length y of the spring and the mass x of the hanging object:

(1) The independent variable in the above table is the mass x of the hanging object, and the dependent variable is the length y of the spring.

(2) When the mass of the hanging object is 4 kg, the length of the spring is 28 cm; when no heavy object is hung, the length of the spring is 20 cm.

(3) Within a certain range, write down the relationship between the length of the spring y (cm) and the mass of the hanging weight x (kg)?

(4) When the mass of the hanging weight is 8 kg (within the allowable range), what is the length of the spring?

Solution: (3) Spring length y=2x+20.

(4) Substituting x=8, we get y=2×8+20=36.

That is, when the mass of the hanging weight is 8 kg (within the allowable range), the length of the spring is 36 cm.

Keywords: Free download of Beijing Normal University edition eighth-grade mathematics PPT courseware for volume 1, function PPT download, one-time function PPT download, .PPT format;

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Update Time: 2024-11-21

This template belongs to Mathematics courseware Beijing Normal University Edition Eighth Grade Mathematics Volume 1 industry PPT template

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