Given that two numbers are coprime, their least common multiple is 90. These two numbers can be () and () or () and ()

9 and 10
2 and 45

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1. A commodity is priced at 40% higher than the cost, and then sold at a 20% discount. As a result, it earns 36 yuan. How much is the cost of this commodity?
2. The least common multiple of two coprime numbers is 315
3. A commodity is priced at 38% of the profit. After 40% is sold, the price is reduced. When all the commodities are sold out, the total profit is 29.72%（ What percentage of the reduction
4. There are two numbers that are coprime numbers and composite numbers. Their least common multiple is 90. These two numbers are () A. 9 and 10B. 2 and 45C. 6 and 15d. 5 and 18
5. The cost price of a commodity is 100 yuan, if you want to make its profit margin in 40% to 60% What is the price range of this commodity?
6. There are two numbers that are coprime numbers and composite numbers. Their least common multiple is 90. These two numbers are () A. 9 and 10B. 2 and 45C. 6 and 15d. 5 and 18
7. The price of commodity a includes 20% profit, and that of commodity B includes 40% profit. The sum of the price of commodity a and commodity B is 480 yuan, The price of a is 60 yuan higher than that of B. how much is the cost of a and B
8. What is the least common multiple of 9 and 19?
9. [math problem] the price of a includes 30% of the profit, and the price of commodity B includes 40% of the profit [math problem] the price of a includes 30% profit, and the price of commodity B includes 40% profit. The total price of the two commodities is 470 yuan. The price of a is 50 yuan more than that of B. what's the cost of a?
10. The least common multiple of 9 and 16
11. Research with calculator (1) Take any number greater than 1, square the positive square root, and then square it. If his square root operation continues, what number is the result close to? (2) Take any number that is less than 1 and greater than 0, square the positive square root, and then square it. If his square root operation continues, what number will the result be close to? (3) Think about it from the angle of inverse operation of square root, that is, square, can you tell the truth?
12. (1) Two composite numbers are coprime, and their least common multiple is 144. These two numbers are () and () (2) The volume of the new cylinder is () cubic decimeter and the surface area is () square decimeter
13. On the application and function of calculator Choose any three digit number (requirement: the number of hundreds is at least 2 times larger than the number of ones), invert the order of the number of hundreds, tens and ones to get another three digit number, subtract the smaller three digit number from the larger three digit number, invert the order of the numbers of the difference to get another three digit number, and add the difference itself to the three digit number, What's the result you got? Try a few more numbers. What do you find? Choose any four digits and follow the rules above. What will you get? What if you choose any five digit number Select any positive number and perform the following operations: add L, then take the reciprocal, and continuously perform the above operations according to the obtained results What did you find? If you change the operation rules (such as "add 2, then take the reciprocal..." Square plus one, then square and take the reciprocal "...) Will we find a similar pattern? With the help of your calculator, get the cycle section separately If a number key (such as 3) on the calculator is broken, how to calculate the formula containing the number? (such as 2 + 3, 34 12, 3 × 49325413,...) What if an operator key is broken? The problem in brackets is 2 + 3,34-12,3 × 49325 △ 413
14. Two coprime numbers whose least common multiple is 702 are______ ．
15. When was the world's first electronic computer born? How many years has it been?
16. The least common multiple of two composite numbers of Coprime is 702, which are (), ()
17. The world's first electronic computer was born in（ A) Mid 1940s B) The 19th century C) Early 1980s D) 1950
18. Two coprime numbers whose least common multiple is 702 are______ ．
19. The first electronic computer in the world is called?
20. Two composite numbers of Coprime whose least common multiple is 702 are () and () kuai