Judgment: 15 and 16 have no greatest common factor

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• 1. The common factor of 34 and 51
• 2. What are the common factors of 18 and 42
• 3. What is the common factor of 39 and 52,
• 4. 91 and 66 common factors
• 5. 1,2,13,27,41,56,63,67,68,70,72,79,80 combination: Prime: odd: even:
• 6. English Olympiad Mathematics, master, please come in! Tom,Billy and Mike plant trees in A and B.They should plant 900trees in A,A and 1250 Trees in B.We knowTOM billy and MIKE trees respectively24,30,32,every day.Tom plant trees in A ,then plant inB ,The two pieces of lands begin and end at the same time.When should Billy turn from A to B? Help translation, please write down the detailed process, Xiaosheng will be grateful!
• 7. How to say "Mathematical Olympiad" in English?
• 8. A. B is 38 kilometers away from each other. A and B set out from both places at the same time and travel in opposite directions. A travels 8 kilometers per hour and B 11 kilometers per hour. A returns to a immediately after arriving at B, and B returns to B immediately after arriving at a. a few hours later, they meet on the way? How far is it from a when we meet?
• 9. The toy store sold two electric toys at the same time, each for 120 yuan. One of them earned 25% and the other lost 25%______ (make or lose)______ Yuan
• 10. The weight ratio of a and B is 4:1. If 10 g is taken from a and put into B, the weight ratio of a and B is 7:5, how many G is there There are two piles of coal, the first pile carries 1 / 3, the second pile carries 3 / 5, the weight of the remaining first pile and the second pile is 3:5, the first pile of original coal is 360 tons, and the second pile of original coal is how many tons?
• 11. [36 10] [60 12] [14 49] [16 64] [18 81] [56 12] [36 20] [20 75 greatest common factor [80 25] [75 30] [28 91] [30 48] [15 75] [25 75] [48 32] [96 36] [64 36] [51 34] [75 35] [42 70] [45 95] do not need to be specific
• 12. 0.82×32+3.2-0.32×91 Clever calculation
• 13. Find the rule: 55, 49, 43, (), 31, (), 19
• 14. Divide the nine numbers 39, 45, 56, 60, 70, 78, 84, 91 into three groups to make the scores of the three numbers in each group equal
• 15. A number is multiplied by 46 and 54 respectively. The sum of the two products is 37400. This number is ()
• 16. Write sentences (English) as required/~ I know the traffic rules 2. This is a light 3. I always go to the shop on foot 4. My home is far 5. Our school is near the post office
• 17. Lala, I'm running against time. You'll fall in love with me
• 18. Let the radius of a circle with an area of 6 π be X (1) Is x a rational number? Tell me your reasons. (2) estimate the value of X (the result is accurate to the tenth), and use a calculator to verify your estimation. (3) what if the result is accurate to the hundredth?
• 19. Lingling and Mingming measure the length of the same textbook. Lingling measures the length of 26cm, Mingming measures the length of 26.0cm. Do they measure the same result? Why?
• 20. There is a kind of disinfectant with a net weight of 250g. Now we need to disinfect the desks and chairs in the classroom according to the above reference manual. How many kg of water does this bottle of disinfectant need? Disinfection reference manual Scrub for 5 to 10 minutes 1. Fruits, tableware, kitchen supplies 1:500 2. White clothes and instant noodles 1:300 3. The contaminant ratio of infectious patients is 1:100