"Using Letters to Represent Numbers" Equations PPT Courseware 3

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"Using Letters to Represent Numbers" Equations PPT Courseware 3

A newly released cartoon book is expected to cost x yuan per copy, and each fairy tale book is 12 yuan more expensive than each cartoon book.

(1)x+12 means ( )

(2)5x means ( )

(3) If each cartoon book is priced at 9 yuan, each fairy tale book should be priced at ( ) yuan

(4) If each cartoon book is priced at 6 yuan, buying 4 of the same cartoon book costs ( ) yuan, and buying 3 of the same fairy tale book costs ( ) yuan.

Letters can not only represent numbers and simple quantitative relationships, but can also represent the calculation formulas of the graphics we have learned. In this lesson, we will study the use of letters to represent perimeter, area and volume formulas.

Unit price × quantity = total price

This quantity relationship is often used when we buy and sell things, so we call this quantity relationship a commonly used quantity relationship.

If we use a to represent the unit price, b to represent the quantity, and m to represent the total price, the quantity relationship between them can be expressed as: a×b=m

If v represents speed, t represents time, and S represents distance, the quantitative relationship "speed × time = distance" can be expressed as: v × t = S

If a represents work efficiency, b represents working time, and c represents the total amount of work, the quantitative relationship "work efficiency × working time = total amount of work" can be expressed as: a × b = c

These are also two commonly used quantitative relationships.

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Update Time: 2024-11-19

This template belongs to Mathematics courseware Western Normal University Edition Fifth Grade Mathematics Volume 2 industry PPT template

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