1. 2, 3, 7, 16, (), 321; how many in brackets If you answer right, you will get points!

1. 2, 3, 7, 16, (), 321; how many in brackets If you answer right, you will get points!

sixty-five
Square of 1 + 2 = 3
Square of 2 + 3 = 7
Square of 3 + 7 = 16
Square of 7 + 16 = 65

Solving 10 mathematical reasoning problems in grade one of junior high school
It's a little longer, not a concept

Grade 7 mathematics volume 2 final test question (1) (time: 90 minutes & nbsp; & nbsp; Full Score: 100 points) one, choose one (3 points for each sub question, a total of 27 points) 1. Among the four figures shown below, ∠ 1 and ∠ 2 are opposite to the vertex angle, there are (a) 0 & nbsp; & nbsp; & nbsp; (b) 1 & nbsp; & nbsp; & nbsp; (c) 2 & nbsp; & nbsp; & nbsp; (d) 3 2, According to the known conditions, the correct conclusion is that (a) ab ‖ CD can be deduced from ∠ 1 = ∠ 5; (b) ad ‖ BC can be deduced from ∠ 3 = ∠ 7; (c) ad ‖ BC can be deduced from ∠ 2 = ∠ 6; (d) ad ‖ BC3 can be deduced from ∠ 4 = ∠ 8; &(a) 3cm, 5cm, 8cm & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; (b) 8cm, 8cm, 18cm & nbsp; & nbsp; (c) 0.1cm, 0.1cm, 0.1cm & nbsp; (d) 3cm, 4cm, 8cm4. Given that the solution of a system of quadratic equations is, then the system is & nbsp; & nbsp; & nbsp; (a) & nbsp; & nbsp; (b) & nbsp; & nbsp; (c) & nbsp; & nbsp; (c) & nbsp; & nbsp; (c) & nbsp; & nbsp; & nbsp; (a) & nbsp; (b) & nbsp; & nbsp; (c) & nbsp; (c) & nbsp; & nbsp; (a) & nbsp; (b) & nbsp; (b) & nbsp; (c) & nbsp; (c) & nbsp; (c) & nbsp; (a) & nbsp; (a) & nbsp; (b) & nbsp; (b) & nbsp; (b) & nbsp; (c) & nbsp; (c) & nbsp; (B; (c) & nbsp; (b; (D) 5. The difference between 3 times of x minus 2 is not greater than 0, and the inequality is listed as & nbsp; & nbsp; & nbsp; & nbsp; (a) 3x-2 ≤ 2 & nbsp; & nbsp; & nbsp; (b) 3x-2 ≥ 0 & nbsp; & nbsp; & nbsp; (c) 3x-2 & lt; 0 & nbsp; & nbsp; & nbsp; (d) 3x-2 & gt; 06; (A) Regular octagons and squares; & nbsp; & nbsp; & nbsp; (b) regular pentagons and regular dodecagons; & nbsp; & nbsp; (c) regular hexagons and squares; & nbsp; & nbsp; & nbsp; (d) regular heptaggons and squares 7. The following statement is wrong (& nbsp; & nbsp;) & nbsp; & nbsp; (a) a can be positive, negative and zero; & nbsp; & nbsp; & nbsp; (B) The cube root of the number a has one; the cube root of C is ± 2; the degree of the angle formed by the bisector of two acute angles of a right triangle is 45 degree; &If the line CD is obtained from the translation of line AB, and the corresponding point of point a (- 1,4) is C (4,7), then the coordinates of the corresponding point of point B (- 4, - 1) are & nbsp; & nbsp; & nbsp; (a) (2,9) & nbsp; & nbsp; & nbsp; (b) (5,3) & nbsp; & nbsp; & nbsp; & nbsp; (c) (1,2) & nbsp; & nbsp; & nbsp; &(d) (- 9, - 4) 2. Fill in (3 points for each question, 27 points in total) 10. In the same plane, there are two straight lines_______ There are two kinds of positional relationships. They are________ . 11. A new figure will be obtained by translating a whole figure along a certain direction_________ And________ 12. If point n (a + 5, A-2) is on the Y axis, then the coordinate of point n is_______ . 13. The ratio of the three internal angles of a triangle is 1: 3: 5, then the degree of the maximum internal angle of the triangle is_____ 14. If every inner angle of a polygon is 140 degrees, then every outer angle of a polygon is equal to 140 degrees_____ It is________ If the solutions of the equations satisfy x + y =, then M=______ 16. If inequality X-2 & lt; 3 and 2-x & lt; 3 hold simultaneously, then the value range of X is_______ 17. If the square root of a positive number is 2a-3 and 5-a, then a=_______ 18. If x and y are real numbers and + (3x + Y-1) 2 = 0, then=_______ (6 points) solving equations: (1) & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; (2) 20. (6 points) (1) solving inequality 3 (x + 1) & lt; 4 (X-2) - 3, (6 points) as shown in Fig. 2, ab ∥ CD, ∠ B = 45 °, d = ∠ e, find the degree of ∥ e.22. (6 points) as shown in Fig. 3, ∥ 1 = ∥ 2, ∥ 3 = ∥ 4, ∥ a = 100 °, find the degree of ∥ bdc.23. (7 points) it is known that a = is the arithmetic square root of M + N + 3, B = is the cube root of M + 2n, find the cube root of b-a.24. (7 points) it is known: as shown in Fig. 4, ad ∥ be, ∥ 1 = ∥ 2, Verification: ∠ a = ∠ e.25. (8 points) as shown in Figure 5, the coordinates of the end point O of the line OA are known as (0,0). (1) write the coordinates of the end point a; (2) translate the line OA upward twice, one unit each time, and write the coordinates of the two end points of the line OA after two translations; (3) on the basis of (2), translate the line OA to the right two units again, Write out the coordinates of the two ends of the line OA; (4) on the basis of (3), it is allowed to translate twice, one unit at a time. Can you restore it to the original position? Please have a try? Answer: 1. 1. B & nbsp; & nbsp; 2. D & nbsp; & nbsp; 3. C & nbsp; & nbsp; 4. A & nbsp; & nbsp; 5. A & nbsp; & nbsp; 6. A & nbsp; & nbsp; & nbsp; 7. C & nbsp; & nbsp; 8. C & nbsp; & nbsp; & nbsp; 9. C 2. 10, Intersection and parallelism & nbsp; 11. Shape, size & nbsp; 12. (0, - 7) & nbsp; & nbsp; 13.100 degrees & nbsp; & nbsp; & nbsp; 14.40 degree, nine & nbsp; 15.0 & nbsp; 16. - 1 & lt; X & lt; 5 & nbsp; & nbsp; 17. - 2 & nbsp; & nbsp; 18.3 three, 19. (1) & nbsp; (2) 20. (1) x & gt; 14, figure omitted; (2) - ≤ X & lt; 1 & nbsp; & nbsp; 21.22.5 degree & nbsp; 22.140 ° 23; &So a = = 3, B = = 2, & nbsp; & nbsp; & nbsp; & nbsp; so B-A = - 1.24. Because ∠ 1 = ∠ 2, so de ‖ BC, so ∠ e = ∠ 3, & nbsp; & nbsp; & nbsp; & nbsp; because ad ‖ be, so ∠ a = ∠ 3, so ∠ e = ∠ a.25. (1) a (2,1); (2) A1 (2,3), O1 (0,2); (3) O2 (2,2), A2 (4,3); (4) omitted