What is the sum of the surface area of a rectangular parallelepiped of 8 cm in length cut into two cuboids? What is the surface area of a rectangular parallelepiped of five centimetres? Apply paint to the four roof pillars of the hall of a building. The cross section of each pillar is 0.5 square. The height of each pillar is 5 meters. The total amount of paint required is 4 yuan per square meter. A classroom is 8 m long and 6 m wide, to paint the walls and ceilings of the classroom, if the area of the doors and windows is 22 square meters, and the average per square meter of paint 0.25 kg, per kilogram of paint to earn 25 yuan, how much do you make

What is the sum of the surface area of a rectangular parallelepiped of 8 cm in length cut into two cuboids? What is the surface area of a rectangular parallelepiped of five centimetres? Apply paint to the four roof pillars of the hall of a building. The cross section of each pillar is 0.5 square. The height of each pillar is 5 meters. The total amount of paint required is 4 yuan per square meter. A classroom is 8 m long and 6 m wide, to paint the walls and ceilings of the classroom, if the area of the doors and windows is 22 square meters, and the average per square meter of paint 0.25 kg, per kilogram of paint to earn 25 yuan, how much do you make

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When we observe human oral epithelial cells, we choose 0.9% saline, if other concentrations of saline? Please design an experiment to prove it. Lab Design: Expected results:

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