"Energy Saving and Emission Reduction" PPT Courseware 5

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"Energy Saving and Emission Reduction" PPT Courseware 5

A water-saving faucet can save 10 milliliters of water per minute

How many milliliters of water can a water-saving faucet save in 2 minutes? 3 minutes, 4 minutes...

do you know?

When writing expressions containing letters:

① When multiplying numbers and letters, the multiplication sign can be written as "·", or it can be omitted. When the multiplication sign is omitted, the number should be written before the letter. For example: a×3 or 3×a can be written as 3·a or 3a

②. When two identical letters are multiplied, they can be written in the form of the square of the letter. 2 is written in the upper right corner of the letter, which should be smaller. For example: c×c=c², pronounced as: c squared

③. When multiplying letters by 1, 1 should be omitted. For example: b×1=b

④. The plus sign, minus sign and division sign cannot be omitted.

10 × t in mathematics

Can be written as: 10·t or 10t

1. The plus sign, minus sign and division sign cannot be omitted.

2. Mathematics habits: numbers first, letters last

3. When the number is 1, you can omit the number 1

For example: 1Y=Y 1Q=Q

Is the following statement correct?

1. a+5 can be written as 5a. ()

2. 1 × d can be written as d. ()

3. b×c can be written as b·c or bc. ()

4. C×C can be written as 2C. ()

Fill it out

Halley's Comet, which we only see once every 76 years, appears again in AD s and will appear again in ( ) AD.

Xiaoxiao has 20 yuan. She spent a yuan to buy a schoolbag, and she still had () yuan left.

The width of a rectangle is 80 cm, the length is x cm, and the area is () cm².

1. A person’s height may differ by 2 centimeters in the morning and evening, with the height being highest in the morning and the shortest in the evening. Yao Ming's height at night is b centimeters, and his height in the morning may be ( ) centimeters.

2. Yao Ming's Rockets played 82 games last year, losing a game and winning ( ) games.

Yao Ming participated in 80 games, with a total score of c points, averaging ( ) points per game.

3. In one game, Yao Ming hit d 2-pointers in succession, scoring () points in total.

This is a difference of ( ) points from his single-game highest score of 41 points.

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For more information about the "Energy Saving and Emission Reduction" PPT courseware, please click on the Energy Saving and Emission Reduction ppt tab.

"Energy Saving and Emission Reduction" PPT courseware 4:

"Energy Saving and Emission Reduction" PPT courseware 4 1. Scenario introduction The electric car traveled 60 kilometers per hour for 2 hours. How many kilometers have you traveled? What mathematical information do you know from the picture? 2. Collaborative Exploration How many kilometers have you traveled? The request has been processed..

"Energy Saving and Emission Reduction" PPT Courseware 3:

"Energy Saving and Emission Reduction" PPT courseware 3 1. Scenario introduction A faucet saves 10 ml of water per minute. Each family saves 50 yuan per year on electricity bills. How many milliliters of water can a water-saving faucet save in 2 minutes? What mathematical information do you know from the picture? 2. Cooperate to explore water-saving faucets..

"Energy Saving and Emission Reduction" PPT courseware 2:

"Energy Saving and Emission Reduction" PPT Courseware 2 1. Scenario introduction A faucet saves 10 ml of water per minute. Each family saves 50 yuan per year on electricity bills. How many milliliters of water can a water-saving faucet save in 2 minutes? What mathematical information do you know from the picture? 2. Cooperate to explore water-saving faucets..

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Update Time: 2024-11-19

This template belongs to Mathematics courseware Qingdao Edition Fourth Grade Mathematics Volume 2 industry PPT template

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