"Removing and Adding Brackets" Integral formulas and their addition and subtraction PPT courseware 2

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Beijing Normal University seventh grade first volume mathematics	pptx	6 MB

"Removing and Adding Brackets" Integral formulas and their addition and subtraction PPT courseware 2

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Upload Time: 2024-10-01

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Description

"Removing and Adding Brackets" Integral formulas and their addition and subtraction PPT courseware 2

Learning purpose requirements

1. Master the rules of bracket removal.

2. Be able to remove brackets correctly as required.

question

Find the similar terms in the polynomial 8a+2b+(5a-b) and think about how to combine similar terms.

Analysis: 8a and 5a are similar terms, and 2b and -b are similar terms. Since 5a and -b are in parentheses, the parentheses must be removed first before similar terms can be combined.

In order to find out the rule of bracket removal, let’s first look at the calculation of a set of formulas:

13+(7-5)=13+2=15,

13+7-5=20-5=15;

9a＋（6a－a）= 9a＋5a=14a，

9a + 6a-a=15a-a=14a

Example 1 Remove brackets:

(1) a+(-b+c-d);

(2) a-(-b+c-d).

Solution: (1) a+(-b+c-d) = a-b +c-d

(2) a-(-b+c-d) = a+b-c+d

Example 2 Remove the parentheses first, and then merge similar items:

(1) 8a+2b+(5a-b); (2) 6a+2(a-c).

Solution: (1)8a＋2b＋(5a-b)

= 8a＋2b＋ 5a-b——No need to change the sign

＝13a＋b——Merge similar items

(2)6a+2(a-c)

= 6a+2a-2c - the distributive law of multiplication

=8a-2c - merge similar items

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For more information about the PPT courseware "Integers and their addition, subtraction and addition of brackets", please click on the Integer expressions and their addition and subtraction ppt removal of brackets and addition of brackets ppt tag.

"Removing and Adding Brackets" Integral formulas and their addition and subtraction PPT courseware:

"Removing and Adding Brackets" PPT courseware on integers and their addition and subtraction. Purpose and requirements: 1. Master the rules of removing brackets. 2. Be able to remove brackets correctly as required. Find the similar terms in the polynomial 8a＋2b＋(5a-b) and think about it. How can I merge similar items. Analysis: 8a and 5a are...

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Update Time: 2024-10-01

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Integers and their addition and subtraction ppt Removing and adding brackets ppt

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"Removing and Adding Brackets" Integral formulas and their addition and subtraction PPT courseware 2