1. The lateral area of the cylinder is a square with a side length of 15.7 cm. What is the surface area of this cylinder in square centimeters?
Answer: bottom radius:15.7÷ 3.14÷ 2 = 2.5 (cm) bottom area: 3. 14×2.5? = 19.625 (square centimeter) Side area: 15.7× 15.7=246.49 (square centimeter) Surface area: 19.625×2+246.49=285.74 (square centimeter)
The surface area of this cylinder is 285.74 square centimeters.
2. The motorcade delivered a batch of relief materials to the disaster area. When it went, it was 80 kilometers per hour, and it took five hours to reach the disaster area. When I come back, I will drive at the speed of 100 km per hour. How long will it take for this team to return to the starting point?
Answer: 80× 5 ÷100 = 400 ÷100 = 4 (hours).
The bookstore has a set of popular science books in 96 yuan at the original price, which are now sold at a 60% discount. How much cheaper can I buy a set? If you buy 6 sets, will 360 yuan be enough?
Answer: 96-96× 60 = 96-57.6 = 38.4 (yuan) 96× 60× 6 = 57.6× 6 = 345.6 (yuan) 345.6.
4. The exchange rate of postal remittance is 1%. Xiaoming's father, who works outside the home, sends money to his family, and he pays the remittance fee from 38 yuan. How much did Xiaoming's father remit home?
Answer: 38 ÷ 1 cut = 3800 (yuan)
These are the more important questions I have sorted out, and I hope I can help you.