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Authoritative PPT Summary
"Letters Can Represent Numbers" Integers and their addition and subtraction PPT courseware
Talk about it
A frog has 1 mouth, 2 eyes, 4 legs, and jumps into the water with 1 plop;
Two frogs with 2 mouths, 4 eyes and 8 legs jump into the water with 2 plops;
Three frogs with 3 mouths, 6 eyes and 12 legs jumped into the water with 3 plops;
Letters can represent any number
Using letters to represent numbers can concisely express the relationship between numbers and quantities, which brings great convenience to our research problems.
Notice:
1. In the same question, the same letter can only represent the same quantity, and different quantities should be represented by different letters.
2. When letters are used to represent a certain quantity in a practical problem, the value of the letter must make the problem meaningful and realistic.
practice
1. Xiao Ming walks to school with a speed of v meters/second. Liangliang rides a bicycle to school with a speed 3 times that of Xiao Ming. Then Liangliang’s speed can be expressed as _______ meters/second.
2. As shown in the figure, use letters to indicate that the area of the shaded part in the figure is _________
3. A three-digit number, the ones digit is a, the tens digit is b, the hundreds digit is c, this three-digit number is ____________
Summary of this lesson:
1. Letters can represent any number;
2. Use letters to represent the operation laws and formula rules of numbers;
3. Using letters to represent numbers can concisely express the relationship between numbers and quantities, simplifying complex problems.
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For more information about the PPT courseware "Integer expressions and their addition and subtraction letters can express numbers" PPT courseware, please click the Integer expressions and their addition and subtraction PPT letters can express numbers PPT tag.
"Letters Can Represent Numbers" Integers and their addition and subtraction PPT courseware 3:
"Letters Can Represent Numbers" Integers and their addition and subtraction PPT courseware 3 Everyone read the following nursery rhyme and fill in the blanks. 1 frog has 1 mouth, 2 eyes and 4 legs, 1 plop jumps into the water; 2 frogs have 2 mouths, 4 eyes and 8 legs, 2 plop jumps into the water; 3 frogs___..
"Letters Can Represent Numbers" Integers and their addition and subtraction PPT courseware 2:
"Letters Can Represent Numbers" Integers and their addition and subtraction PPT courseware 2. Just think of a natural number between 1 and 9, multiply this number by 5 and subtract 1, then multiply the result by 2 and add 2 to the single digit. how many. 1. First use the following children's song: 1 frog, 1 mouth, 2 eyes...