"Addition and Subtraction of Integers" PPT Courseware 3

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"Addition and Subtraction of Integers" PPT Courseware 3

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(1) 100 ×2 +252 × 2 = (100 +252) ×2

(2) 100 ×(-2) +252 ×(-2) = (100 +252) ×(-2)

Complete the following calculations according to the methods in (1) and (2), and explain the rationale: 100 t+252t=_____________

Terms like 3x2 and 2x2 (or 3ab2 and -4ab2) that contain the same letters and have the same exponent are called homogeneous terms.

Usually we arrange the sum of a polynomial in the order of the exponent of a certain letter from large to small (descending power) or from small to large (raising power). For example, -4x²+5x+5 can also be written as 5+5x-4x².

(1) The water level in the reservoir dropped for an hour continuously on the first day, with an average decrease of 2cm per hour; it rose for an hour continuously on the second day, with an average increase of 0.5cm per hour. What is the overall change in the water level during these two days?

(2) A certain store originally had 5 bags of rice, each bag of rice weighing x kilograms. I sold 3 bags in the morning and bought 4 bags of rice in the same package in the afternoon. How many kilograms of rice does this store have after the purchase?

Comprehensive expansion

Xiaoli did a math problem: "Given that the two polynomials A, B, and B are 4x²-5x-6, find A+B." Xiaoli regarded A+B as A-B and the calculation result was

-7x²+10x+12. Based on the above information, can you find the result of A+B?

Keywords: courseware for addition and subtraction of integers, PPT courseware for seventh-grade mathematics volume 1 of the New People's Education Press, download of seventh-grade mathematics slide courseware, download of PPT courseware for addition and subtraction of integers, .ppt format

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"Addition and Subtraction of Integers" PPT courseware 8:

"Addition and Subtraction of Integers" PPT Courseware 8 Activity 1: Xiaohong and Xiaoming each wrote an expression on their own pieces of paper. Xiaohong: 2x-3y Xiaoming: 5x+4y Question: (1) Xiaohong said, find out Their sum. can you help her? (2) Xiao Ming said, find 5x+4y and 2x-3..

"Addition and Subtraction of Integers" PPT Courseware 7:

"Addition and Subtraction of Integers" PPT Courseware 7 The meaning of addition and subtraction of integers is the algebraic operation of finding the sum or difference of several integers 1. Find the sum of the monomials 2x2y3, -4x2y3 and -3x2y3. Solution: 2x2y3+(-4x2y3)+(-3x2y3) = 2x2y3-4x2y3-3x2y3) = -5x2y3 ..

"Addition and Subtraction of Integers" PPT Courseware 6:

"Adding and Subtracting Integers" PPT Courseware 6 Learning Objectives 1. Be able to skillfully and correctly use the rules of merging similar terms and removing parentheses to add and subtract integers. 2. Be able to use the operations of integers to simplify polynomials and evaluate them. 3. In the addition and subtraction operations of integers, comprehend and transform thoughts, and experience...

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Update Time: 2024-11-22

This template belongs to Mathematics courseware People's Education Press Seventh Grade Mathematics Volume 1 industry PPT template

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