There are two piles of mud. Originally, the mass of cement in pile a is 5 / 7 of that in pile B. now, 12 tons of cement are transported from pile B to pile A. at this time, the mass of cement in pile a is 7.8% How many tons of cement are there in a and B piles

"Transport 12 tons of cement from pile B to pile A. at this time, the 7 / 8 of pile a's cement."

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1. Real numbers a, B, C, D, satisfy, d > C, a + B = C + D, a + D
2. If a √ a + B √ B ＞ a √ B + B √ a, then the condition that real number a B should satisfy is
3. Let a and B be two real numbers. The following conditions are given 1.a+b=2 2.a+b>2 3.a+b=2 4.a^+b^>2 5.ab>1 If at least one real number of a and B is greater than 1
4. Let a, B, C ∈ positive real number, a + B + C = 7, then the maximum value of √ a + √ B + √ C is
5. a. B and C are positive real numbers, which are not equal to each other and ABC = 1
6. As shown in the figure, the real numbers corresponding to two points a and B on the number axis are 1 and 3 respectively. If the symmetric point of point a about point B is point C, then the real number corresponding to point C is______ ．
7. The corresponding points of real numbers a, B and C on the number axis are shown in the figure —————_ 4——_ 3—— _ 2—— _ 1 ——O——1——2——3——4——5——— A is between minus 4 and minus 3, B is between minus 1 and minus 2, and C is between two and three Simplification: | A-B | - | C-A | + | B-C|
8. It is known that a, B and C denote the side length of △ ABC, m ＞ 0. Proof: AA + m + BB + m ＞ CC + M
9. If we know that the three vertices of △ ABC are a (2,2), B (0,1), C (4,3), and the point d (m, 1) is on the line where the height of the edge BC is located, then the real number M=______ ．
10. In △ ABC, if the edges opposite angles a, B and C are a, B, C, M = (3b-c, COSC), n = (a, COSA), m ‖ n respectively, then the value of cosa is equal to () A. 36B. 34C. 33D. 32
11. The price of 20 kg apple and 30 kg pear is 132 yuan. The price of 4 kg apple is equal to that of 5 kg pear Please write down the process Just one unknown X Please use the method of the first volume of the fifth grade
12. The speed ratio of the two vehicles is 3:4. After 5 / 4 hours, the two vehicles meet. The distance ratio of the two vehicles is (): ()
13. There are two cargo ships. The cargo carrying capacity of ship a is 25% more than that of ship B. ship a and ship B carry 1800 tons of cargo in total. What are the cargo carrying capacity of ship a and ship B? (use the equation to solve the problem.)
14. Some coal has been transported by Party A alone for six times and Party B alone for five times. Now Party A has transported three times and Party B has transported two times, with a total of 18 tons. How many tons in total?
15. As shown in the figure, in the quadrilateral ABCD, ab = BC, BF is the bisector of ∠ ABC, AF ‖ DC connects AC and CF
16. A and B two cars from East and west at the same time, the distance ratio is 5:3 when they meet. At this time, B car is 80 kilometers away from the center of the two places How many kilometers are there between the East and the west?
17. Find the square of all numbers 11-24
18. It takes 15 hours for a car to go from place a to place B, and 12 hours to return. The speed of return is increased by () a.1/4 b.1/5 C.1 / 6
19. What are the average and variance of a set of data 1.2.3.4.5?
20. The two trains a and B leave each other from the two cities at the same time. When car a travels 36 kilometers less than car B, the two trains are 264 kilometers apart. Given that the speed ratio of car a and B is 5:6, how many kilometers are the two cities apart