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"Algebraic Formulas" Integral formulas and their addition and subtraction PPT download (Lesson 2)
Part One: Learning Objectives
1. Be able to find the value of an algebraic expression and explain the actual meaning of the value of the algebraic expression. (Key points)
2. Use algebraic expressions to evaluate and infer the laws reflected by algebraic expressions. (Difficulty)
Algebraic PPT, part 2: introducing new lessons
Situation introduction
According to newspaper records, a doctor studied and came up with a formula for predicting the height of children as adults from the height of their parents: a son's height is half the sum of his parents' heights, multiplied by 1.08; a daughter's height is 0.923 times the father's height plus the mother's height. The sum is divided by 2.
(1) It is known that the height of the father is a meter and the height of the mother is b meters. Use algebraic expressions to express the heights of the son and daughter;
(2) The height of the father of the fifth-grade girl Xiaohong is 1.75 meters and the height of the mother is 1.62 meters. The height of the father of the sixth-grade boy Xiaoming is 1.70 and the height of the mother is 1.62. Try to predict who will be taller, Xiao Ming or Xiao Hong, when they become adults. ?
Algebraic PPT, Part 3: Teaching new courses
Find the value of an algebraic expression
Discuss
Fill in the table below and observe how the values of the following two algebraic expressions change.
(1) As the value of n gradually becomes larger, how do the values of the two algebraic expressions change?
(2) Estimate which algebraic expression’s value exceeds 100 first.
[Summary] The value of an algebraic expression is determined by the value of the letters it contains, and changes with the change of the value of the letters. When the letters take different values, the values of the algebraic expression may be different or the same.
Whole substitution evaluation
Algebra PPT, Part 4: Practice in class
1. When a=2, b=1, c=3, the value of the algebraic expression c-(c-a)(c-b) is ( )
A. 1 B. 2 C.3 D.4
2. If 2a+3b=5, then 4a+6b-7=＿＿.
3. It is known that a+b=5, ab=6, then ab-(a+b)=___.
4. As shown in the figure is a numerical conversion machine. If the input x is -5, the output result is _______.
5. When x=-3, y=2, find the value of the following algebraic expression:
Algebraic PPT, Part 5: Class Summary
Evaluation of algebraic expressions
numerical converter
Substitute directly into the evaluation
Whole substitution evaluation
Keywords: Free download of Beijing Normal University Edition seventh-grade mathematics PPT courseware for volume 1, algebraic formula PPT download, integer expressions and their addition and subtraction PPT download, .PPT format;
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 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...
"Algebraic Formulas" Integral formulas and their addition and subtraction PPT (Lesson 2):
"Algebraic Expressions" Integer expressions and their addition and subtraction PPT (Lesson 2) Part 1 content: Knowledge points Basic knowledge point 1 Substitute directly to find the value of the algebraic expression 1. When m=2, the value of the algebraic expression 1/2 (m+8) is equal to ( A ) A.5 B.4 C.3 D.2 2. When a=-1b=2/5c=2, find the algebraic expression..