Is 0.3-0.2 = - x a linear equation with one variable

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• 2. How many centimeters is one inch? How many centimeters is one minute?
• 3. Cuboid or cube volume is equal to volume. The volume of a wooden box is 4 cubic decimeters, it can hold 4 cubic decimeters of goods The volume of a cuboid or cube is equal to its volume The volume of a wooden box is 4 cubic decimeters. It can hold 4 cubic decimeters
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• 6. The volume of a cone is 24 cubic decimeters, the bottom area is 6 square decimeters, and the height is () decimeters
• 7. The height of a cylinder is 5 decimeters, the side area is 62.8 square decimeters, and the volume is 1______ ．
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• 9. One cubic decimeter Five examples
• 10. What is a cubic decimeter?
• 11. A piece of A4 paper as a load bearing paper bridge A paper bridge made of A4 paper, 7 feet apart between two tables, can only use glue and scissors Note: it's not the kind of paper bridge where heavy objects are placed on the paper bridge, but the kind where heavy objects are placed on a board hung under the paper bridge Better get a reply on the same day! Oh, oh Wrong It's inches --||||| Inch sounds so much like feet that I always make mistakes|| It's hung with a rope. There's no base. The weight is iron
• 12. How to calculate the simple operation of "3 / 4 minus 2 / 7 plus 1 / 4 plus 5 / 7"? Please make a formula, thank you!
• 13. There are 7 people in a tour group. They are going to the railway station by two cars (5 people in each car including the driver). One of them breaks down at a distance of 10km from the railway station. At this time, there are 40 minutes to check in. At this time, the only available car is another car. Assuming that the average speed of the car is 40km / h and the speed of the passenger walking is 4km / h, there are three schemes (1) The car first takes four people to the railway station, the other three people wait in place, and then take the car back to the railway station (2) While the car takes four people to the railway station, the other three people walk first and then take the car back to the station (3) The car first takes four people to an underground car and returns. These four people walk to the station, while the other three people walk first and then take the car back to the station, and two groups of people arrive at the railway station at the same time Through calculation to determine whether these three schemes are feasible, if feasible, which scheme takes time?
• 14. The four numbers can be divided by 2357, and the quotient is the same. The sum of the four numbers is 408. What are their respective numbers,
• 15. The passenger car and the freight car leave from a and B at the same time. The passenger car travels 60 kilometers per hour. It takes 10 hours for the freight car to complete the whole journey Passenger cars and freight cars leave from a and B at the same time. Passenger cars travel 60 kilometers per hour. It takes 10 hours for freight cars to complete the whole journey. When freight cars travel to 13 / 24 of the whole journey, passenger cars already travel 5 / 8 of the whole journey. How many kilometers is the distance between a and B?
• 16. It is known that the circumference of an isosceles triangle is 30cm, and the length of one side is twice the length of the other side Length of each side
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