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"Application of Proportion" Proportion PPT Courseware 6
1. Review old knowledge
(1) Judgment
Determine whether two related quantities are proportional? In what proportion? Give reasons.
(1) The total distance, speed and time are certain. ( )
(2) The total number of pages is certain, the number of pages read and the number of remaining pages. ( )
(3) The unit price for purchasing pencils is certain, the total price and quantity. ( )
(4) The car travels at a certain speed, the distance traveled and the time. ( )
2. Explore new knowledge
An office building used to consume an average of 100 kilowatt hours of electricity for lighting every day. After switching to energy-saving lamps, the average electricity consumption is only 25 kilowatt hours per day. How many days can the original 5-day electricity consumption be used now?
When the total electricity consumption is constant, the electricity consumption time is inversely proportional to the electricity consumption per unit time. That is to say, before and after replacing energy-saving lamps, the daily electricity consumption is equal to the product of the number of electricity consumption days.
3. Application of knowledge
There are two kinds of ballpoint pens in the school store. Xiao Ming has just enough money to buy 4 pens with a unit price of 1.5 yuan. If he only buys the one with a unit price of 2 yuan, how many pens can he buy?
Do you know which quantity is constant? Can this be solved using proportions?
4. Assign homework
Homework: Exercise 11 on page 64, questions 5 and 8; Exercise 11 on page 65, questions 10, 11 and 12.
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