How can I get 24 by adding, subtracting, multiplying and dividing 3 5S and 1 1s

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• 1. Add, subtract, multiply and divide with 3, 4, - 6 and - 10, the result is 24
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• 3. 4o4o4o4o4o4 = 0, add, subtract, multiply and divide in O. the symbol can be used repeatedly. Multiply and divide first, then add and subtract. Brackets cannot be used
• 4. Exercise book! 48 / 56 minimalist score! Fifty six out of 48! Which is the simplest score? 11 out of 22, 4 out of 9, 12 out of 15, 9 out of 72, 14 out of 15, 16 out of 27, 19 out of 57, 5 out of 12? And turn the rest into the simplest score Multiplication sign: ×, division sign: △, please write the process (write the multiplication or division sign beside, please copy!
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• 9. On the growth rate If the number of fixed line telephones was 10 million in 2000 and 70 million in 2008, what is the increase rate? 7000 divided by 1000-1 = 70%? If it is a year, there will be 8 years from 2000 to 2008
• 10. The first semester of junior high school on the rational number addition and subtraction mixed operation problem! calculation: 1.23－17－（-7）+（-16） 2.0 + 1 - [(- 1) - (minus three seventh) - (+ 5) - (minus four seventh)] + | - 4| 3.（-2.5）－（+2.7）－（-1.6）－（-2.7）+（+2.4） Simplification: |a-b | + |a + C | - |b-c | + |2c| When a = - 3, C = - 2, find the value of the above formula be careful
• 11. How to calculate that the result of 3, - 5, - 7 and (- 13) is 24?
• 12. Solving equations and practical problems The distance between the two places is 42 kilometers. Xiaoming starts from place a to place B by bike at a speed of 20 kilometers. 0.4 hours later, Xiaogang starts from place B by motorcycle. 0.5 hours later, they meet on the way,
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• 17. Use the largest integer as divisor to remove 265, 365 and 607, and the remainder is 1, 5 and 7 respectively. Q: what is the divisor? There is rectangular land, 532 meters long and 308 meters wide. Now trees are planted in four corners, four corners and all around. The distance between the two trees is equal and requires the maximum. How many trees can be planted? What is the distance between the two trees?
• 18. There were 8 sandstorms in 1960's, 7 / 4 in 1980's and 16 / 7 in 2001-2004 in the new century. How many sandstorms occurred in 2001-2004?
• 19. The speed of a, B and C is 30 meters, 40 meters and 50 meters per minute respectively. A and B set out in the same direction at the same time in a, C set out from B to catch up with a and B at the same time, and C took 10 minutes to catch up with B after catching up with a, then the distance between AB and B is______ ．
• 20. (1) The volume of a cuboid water tank is 200 liters. The bottom of the water tank is a square with a side length of 50 cm. What is the height of the water tank? (the thickness of the water tank is ignored) (2) A square billet with an edge length of 6 decimeters is forged into a rectangular steel bar with a cross section of 6 square decimeters. How long is the steel bar? (3) A cuboid is 8 cm in length, 6 in width, and 5 cm in height. The sum of its edges is (?), its surface area is (?) square centimeter, and its volume is (?) cubic centimeter (4) The total edge length of a cube is 24 decimeters, the surface area is (?) square decimeters, and the volume is (?) cubic centimeters (5) If a pool can hold 30 cubic meters of water, then 30 cubic meters is not only the (?) of the pool, but also the (?) of the water (6) A cube with 4 edges can be made up of a cube with 8 cm edge length (Note: This is to fill in the blanks. You don't need to use the formula. The answer is OK.) I want to calculate the formula. If it's right, I'll definitely add points. When I write it, I'll indicate the number of questions The places that need to fill in the blanks. The ones that don't have to fill in the blanks are practical problems. The practical problems need to calculate the formula, and you can do as many as you can,