Can you compare the size of - 119 / 120 and 120 / 121 with the division of rational numbers?

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• 1. Can you compare the size of - 120 / 119 and - 121 / 120 by rational division?
• 2. If you can calculate simply, you should calculate simply 9 / 10 × 5 + (1 / 2 + 4 / 5) × 5 87.5% - 3 / 4 × 5 / 6 + 25%
• 3. Simple calculation Simple calculation: 66 × 101 6.86-1.57-3.43 5.2 × 8.4 + one and three fifths × 5.2 One and a quarter × 25 × 4 × 8 Calculation: 2.3 + 0.45 △ 0.9-0.75 188÷47×122÷8 3.6-1 × (0.75 + 1 / 3) × 13 / 8 8 / 9 × [3 / 4 - (7 / 16-1 / 4)]
• 4. Calculation (all simplified) 2014 × 2012 / 2013 2012 × 2012 / 2012
• 5. Help to calculate, can calculate simply 1 - (3 and 1 / 2-2 and 1 / 2 △ 1 and 1 / 4) * 4 / 9 2000 △ 5 / 21-3 and 1 / 5 * 2000 [0.186 + (1 and 3 / 4-1 / 2) - 0.186-1 and 1 / 4] + 45 7/10÷（1-3/4*0.4）
• 6. Simple calculation and calculation （1） （9991*1999.1999+9991.9991*1999）/2.0002 （2） （170+1/12）/13 （3） （8888008*125
• 7. Division of quadratic radical. Simplification √121a*4/36b²（b＞0）
• 8. On Division To water / honey = how many kilograms of honey per kilogram, or how many kilograms of water per kilogram . A series of. Help me write a few. Tell me why, How about the floor area and the number of bricks? Or the number of bricks and the floor area
• 9. How to guess the divisible integer by long division Long division is also called big division. For example: x ^ 3 + 3x-4, how do you know that he can divide by X-1 to get the remaining factor? I mainly want to know how to guess that he has X-1 ? Why divide by X-1 instead of other factors, such as x-3, X-2, etc. How do you know it's divided by X-1?
• 10. Long division, who knows?
• 11. Compare the size of - 119 / 120 and - 120 / 121 by rational division
• 12. On calculation and fractional division A 10 meter long rope, the first use of 1 / 5, the second use of 1 / 5 meters, there are () meters left Two thirds of an hour and one third of two hours are () minutes The 1 / 9 of 7 meters is as long as the 7 / 9 of () meters 5 / 7 of () tons is 10.5 tons A car can travel 30 kilometers in 2 / 5 hours, and it can travel () kilometers in 20 minutes A car runs 30 kilometers in 2 / 5 hours. According to this calculation, it takes () hours to travel 25 kilometers 0.375÷1/8×25/24 2.6÷5/3 1/5÷（2/3+1/5）×15 3/8×8÷3/8×8 6.8×8/25+0.32×3.2 （7/12+11/18）÷5/36 0.375÷1/8×25/24 2.6÷5/3 1/5÷（2/3+1/5）×15 3/8×8÷3/8×8 6.8×8/25+0.32×3.2 （7/12+11/18）÷5/36 To prove an equation What can be simple should be simple
• 13. Calculate by Division There are 118 students in Grade 6. One fifth of the boys and 10 girls go to the nursing home to take part in voluntary labor. The remaining boys and girls are equal in number. How many boys are there?
• 14. Divide 80 Xiaofeng Xiaoyu Xiaoming is the best friend in the kindergarten. Xiaofeng weighs 14kg, which is 7 / 8 of Xiaoming's weight. Xiaoming weighs 1 / 15 of Xiaoyu's weight. How many kg should Xiaoyu weigh For a road, 3 / 8 of it was built on the first day, 6 / 7 of it was built on the second day, and 221m was left. How long is the road? These are two questions~
• 15. On the division of a mathematical problem! Xiaoxiao said, "I spent three days reading a quarter of this book." mischievous said, "I spent four days reading a third of this book." Q: who can read faster, Xiaoxiao or mischievous? Find the formula, not the equation
• 16. On the mathematical problems of fractional division! 1: What is two fifths divided by two? 2: What is five out of seven divided by five? 3: What is two fifths divided by three? 4: What is two thirds divided by eight? 5: What is six out of thirteen divided by nine? 6: What is seven out of twelve divided by twelve? 7: What is three fourths divided by three? 8: What is five eighths divided by five?
• 17. How to calculate "fraction division" in unit 3 of mathematics in Grade 6 of primary school? The teacher told us to give a lecture on the platform. It's better to have a list of questions
• 18. Problem solving by division of sixth grade mathematics The man-made earth satellite runs 84 meters per second, which is 57 times slower than the speed of the spaceship. How many kilometers does the spaceship run per second? (arithmetic, no equations. Why do you do this
• 19. What is the alphabetic expression of multiplicative distributive law?
• 20. The letter formula of the law of multiplicative distribution I need this formula to be replaced by letters, such as the commutative law of multiplication a * b = b * a