For a number, the sum of its three digits is 20. And it is the largest three digits of all the multiples of 5 made up of its three digits. This number is ()

nine hundred and sixty-five

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1. The two elements represented by the atomic numbers of the following groups can form AB2 type ionic compounds () A. 6 and 8b. 11 and 13C. 11 and 16d. 12 and 17
2. The two elements represented by the atomic numbers of the following groups can form AB2 type ionic compounds () A. 6 and 8b. 11 and 13C. 11 and 16d. 12 and 17
3. It is known that elements a and B can form AB2 and A2B It is known that elements a and B can form AB2 and A2B. The relative molecular mass of AB2 is 46 and that of A2B is 44. The relative atomic mass of a and B is calculated
4. a>1,-1
5. Inquiry learning: known a < 0, - 1 < B < 0, try to compare the size of a, AB, AB2
6. We know Ab0, and a + B
7. a> 1, b > 1, and a ≠ B, then the relationship between a and 178; B + AB and 178; and a and 178; + B and 178; is positive
8. Known a
9. If a > 1, - 1
10. Let a and B belong to R. compare the relationship between a square + b square + 1 and ab + A + B
11. As shown in the figure, the mass of the shell of the spring scale is M0, and the mass of the spring and the hook is ignored. The mass of a heavy object suspended by the hook is m. now the external force F in a vertical direction is used to pull the spring scale to make it move upward uniformly and accelerate. The reading of the spring scale is: () A. Mg; B. [M / (M0 + m)] mg; C. [M0 / (M0 + m)] f; D. [M / (M0 + m)] f according to Newton's second law Overall study f = (M0 + m) a Research object f bullet = ma The result shows that the reading F of spring scale is [M / (M0 + m)] f, why f = (M0 + m) a instead of F = (M0 + m) a + (M0 + m) g
12. If the side length of a square is 3 and the side length increases x, the area increases y, the analytic function of Y changing with X is obtained
13. A small ball with a mass of 0.1kg is suspended on the top of the inclined plane with an inclination angle of 37 ° by a thin wire, as shown in Figure 11. When the system is stationary, the rope is parallel to the inclined plane, A small ball with a mass of 0.1kg is suspended at the top of the inclined plane with an inclination of 37 degrees by a thin wire. The static state of the system is that the rope is parallel to the inclined plane, regardless of all friction, and the system accelerates. When the accelerations are 5m / s, 10m / s and 24m / s respectively, what are the pulling forces on the rope I just don't want to forget it,
14. I want to ask the experts what are the units of voltage, current and resistance when they convert?
15. A spring with stiffness coefficient K. cut it into two equal length segments, and then combine the two segments to form a new spring. What is the stiffness coefficient of the new spring
16. What are the physical quantities of electric power? What are their units? What are their letters?
17. By solving the system of linear equations of two variables, A garment factory processes a batch of suits. It can cut 10 coats or 13 pairs of trousers every 15 meters. The existing material is 345 meters. In order to match the coats and trousers, how many meters of the material are allocated to the coats and trousers?
18. The resistance ratio of a and B is 4:5. If a and B are connected in parallel in a circuit, the total power consumed is 18W, then the electric power of a and B is respectively 18W____ W、_____
19. If we know that 3-2a of a + 2-4b + 5 of B = 0, then B of a =?
20. Two bulbs marked with 220 V, 100 W and 220 V, 40 W are connected in series in a 220 V circuit. Why is 40 W better than 100 W