"Algebraic Formulas" Integral formulas and their addition and subtraction PPT courseware 3

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"Algebraic Formulas" Integral formulas and their addition and subtraction PPT courseware 3

(1) n kilograms of fertilizer per mu are planned for a mu of rice, m kilograms of fertilizer are planned for b mu of corn, and a total of ________ kilograms of fertilizer are applied.

(2). The square of the sum of a and b can be expressed as___________.

(3). The difference between 4 times x and 3 can be expressed as ____________.

(4). There are a passengers in the car. On the way, b passengers got off, and then c passengers came up. Now there are ________ passengers in the car.

(5). The temperature after the temperature rises by t°C from 2°C is ________°°C.

(6) Xiaoliang walked s meters in t seconds, his speed is ________ meters\seconds

(7) Xiaohua spent 166 yuan to buy x pens with a unit price of 5 yuan, and the remaining money was ________ yuan. He could buy at most ________ pens of this kind

Standard way of writing algebraic expressions:

(1) a×b is usually written as a·b or ab;

(2) 1÷a is usually written as 1/b;

(3) Numbers are usually written before letters; for example: a×3 is usually written as 3a

think about it

What else can the algebraic expression 10x+5y represent?

1. The teacher has x pieces of 10 yuan and y pieces of 5 yuan. Then 10x+5y represents how much money the teacher has.

2. A car drove at a speed of x kilometers/hour for 10 hours, and then drove at a speed of y kilometers/hour for 5 hours. Then 10x+5y represents the distance traveled by the car.

3. A certain mathematics material costs 10 yuan each, and each English material costs 5 yuan. Xiao Ming bought x mathematics materials and y English materials, then 10x+5y represents how much money was shared.

practice

The number of rows of seats in the electronic classroom is m, expressed algebraically:

(1) If the number of seats in each row is 6/5 times the number of rows, how many seats are there in the electronic classroom?

(2) If the number of seats in the first row is a, and the number of seats in the next row is always 1 more than the number of seats in the previous row, how many seats are there in the mth row in the electronic classroom?

A mobile company has opened a communication service between China and China. ⑴ Global Telecom users pay a monthly fee of 50 yuan first and then pay another 0.4 yuan for every minute of the call. (2) Gold Card Express users do not pay a monthly fee and pay for every 1 minute of the call. Call fee 0.6 yuan

1. For x minutes of calls per month, find out how much the customer should pay for the phone calls under the two charging methods?

2. A customer calls for 300 minutes a month. Which communication method do you think is more cost-effective?

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For more information about the PPT courseware "Integers and their addition and subtraction algebraic expressions", please click on the PPT tab of "Integers and their addition and subtraction algebraic expressions".

"Algebraic Expressions" Integers and their addition and subtraction PPT download (Lesson 2):

"Algebraic Expressions" Integral Expressions and Their Addition and Subtraction PPT Download (Lesson 2) Part One: Learning Objectives 1. Be able to find the value of algebraic expressions and explain the actual meaning of the values ​​of algebraic expressions. (Key Points) 2. Use algebraic expressions to evaluate and infer the values ​​reflected by algebraic expressions Rules. (Difficulty) ... ... ....

"Algebraic Formulas" Integral formulas and their addition and subtraction PPT download (Lesson 1):

"Algebraic Expressions" Integral Expressions and Their Addition and Subtraction PPT Download (Lesson 1) Part One Content: Learning Objectives 1. Understand the concept of algebraic expressions, and be able to use algebraic expressions to express quantitative relationships in simple problems; (Difficulty) 2. Be able to use algebraic expressions in specific situations. Find the value of the algebraic expression and interpret it..

"Algebraic Formulas" Integral formulas and their addition and subtraction PPT download:

"Algebraic Expressions" Integral Formulas and Their Addition and Subtraction PPT Download Part One: Review In the last lesson, we used matchsticks to put together the square as shown in the picture. The quantitative relationship between the number of squares and the number of matchsticks used was found, and letters were introduced, that is, using letters...

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Update Time: 2024-09-28

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

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