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

The formula of multiplicative allocation rate: a * (B + C) = a * B + A * C;

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1. What is the alphabetic expression of multiplicative distributive law?
2. 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
3. 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
4. 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?
5. 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
6. 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~
7. 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?
8. 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
9. Compare the size of - 119 / 120 and - 120 / 121 by rational division
10. Can you compare the size of - 119 / 120 and 120 / 121 with the division of rational numbers?
11. Given a = 10, what is the result of the expression a * = 3 + 4? 3Q
12. On the equation of X: (A-2) \ \ (X-2) + (A-2) \ \ (2-x), there are innumerable solutions. For the value of a, please write the steps, 3Q
13. There are several expressions for quadratic inclusions
14. Mathematics is the same as the division of base power. It is required to write out the whole process The negative third power of (2Ab & # 178;) / (the negative first power of 2A & # 178; b) &# 178;
15. Three division problems of the same base power 1. If 2 (X-2) ^ 0 is meaningful, then x_________ 2. Given 10 ^ m = 3 and 10 ^ n = 2, find the value of 10 ^ 2m-n 3. Given 3 ^ 2m = 6 and 9 ^ n = 8, find the value of 3 ^ 6m-4n
16. On the division of the same base power 1. The speed of light is about 3 times 10 km / s. if the distance between the earth and the sun is 1.5 times 10 km / s, how long does it take for the sun to reach the earth? 2. A city has put forward the goal of today's economic development to about one million citizens of the city: "more than 10 billion, strive for a well-off life. What is the per capita target? 3. Fold a piece of paper with a thickness of 0.1 mm in half for 20 times. How many times of the thickness of 128 pieces of the same paper?
17. On the division of the same base power If x power of 2 = 3 and Y power of 4 = 5, then x-2y power of 2 is? It's better to take the process and be accurate,
18. Division of the power of the same base in Mathematics (3 / 2) times are 0 + (- 1) times are 3 + (3 / 1) times are - 3 / absolute value - 3
19. A problem of division of the same base power Given that the x power of 128 is 8 × 2 to the 11th power, find the value of (x-1) to the power of 2008
20. 3 times 0.4 equals 1.2, and 3 is a factor of 1.2