What are the topics on pages 75-76 of the first volume of mathematics in the first day of the People's Education Edition?

75 has no title, 76 is: 1. Use the formula:

(1) The temperature difference of a winter day in a certain place is 15c. What is the lowest and highest temperature on this day?

(2) How much does it cost to buy N rackets with a unit price of C yuan? How much should 50 yuan get back?

(3) The original price of commodity A is B yuan per piece, with the first price reduction of 20% and the second price reduction 10 yuan per piece. What's the price after the first price reduction? How about the price after the second price reduction?

(4) In 30 days, Xiao Zhang's long-distance running has reached 45,000 meters, but the distance is as small as one meter (a & gt45000). How many meters do Xiao Li and Xiao Zhang Run run on average every day?

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