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1. There are 9 playing cards, and their points are 1 23 4 5 6 7 8 9. It is known that the average number of 5 playing cards on the left is 6, and the number of points of 5 playing cards on the right is 4. What is the card in the middle? 2. The bottom radius and height of the two containers are 5cm and 15cm respectively. First put two pieces of ice into the cylinder, and then pour all the juice in the cone into the cylinder. This is the height of the liquid level in the cylinder, which is 7cm (the ice is completely submerged). Calculate the area of the original two pieces of ice 3. Father and son start from the starting point of 100m runway at the same time and walk to the terminal at a constant speed. When father walks 40m, son walks 30m. According to this calculation, when father reaches the terminal, how many meters is the son away from the terminal? If father returns immediately after reaching the terminal, how many meters will he meet his son?
1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 = 455 * 6 = 304 * 5 = 2030 + 20-45 = 5. The card in the middle is 5 points. The second question is volume? 15 / 3 = 5cm7-5 = 2cm3.14 * 5 square * 2 = 157 cubic centimeter. The volume of the two pieces of ice is 157 cubic centimeter. 100 / 40 / 30 = 75m, 100-75 = 25m, 40 / 30 = 4 / 34 + 3 = 7 parts, 25 * 4 / 7 = 1
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