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Authoritative PPT Summary
"Using Letters to Represent Numbers" Equations PPT Courseware
Use letters to represent numbers
They are all represented by some symbols or letters, such as ■, ▲, ● or �, x, n, m. These symbols and letters can be used to represent numbers.
The laws of operation, properties, calculation formulas... all use letters or symbols to represent numbers.
In mathematics we often use letters to represent numbers.
What other examples have you seen of using symbols or letters to represent numbers?
In expressions containing letters, the multiplication sign between the letters can be written as "·", or it can be omitted.
� ×b = b× �
It can be written as � · b = b · � or � b=b �
Use �, b, and c to represent three numbers respectively, and write other operation laws.
Summary
(1) The letter representation is concise, easy to remember and easy to apply.
(2) The multiplication sign can be expressed with "·" or omitted.
(3) Other arithmetic symbols between letters cannot be replaced by dots, nor can they be omitted.
Can you fill it out?
1 frog (1) mouth (2) eyes (4) legs
2 frogs (2) mouths (4) eyes (8) legs
3 frogs (3) mouths (6) eyes (12) legs
…
� frog (�) mouth (2 �) eyes (4 �) legs
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