Number reasoning questions 77,49,28,16,12,2,10 b.20 c.36 d.45

A .10
The number after is equal to the difference between the two before

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1. Figure reasoning 1.4.11.27.61.133
2. 1. Given x ^ 2 + xy = 10, y (x + y) = 15, then x + y =? 2, if (a-b) ^ 2-2a + 2B + 1 = 0, then A-B =? 2?
3. Given that x = 2Y = 5 and x = 1y = 10 are solutions of the equation AX + by = 15, then a=______ ，b______ ．
4. Given that a = x minus 15 / 2, and X is a natural number less than 10, find the value of positive integer a
5. Given that {x = 2, and {x = 1, are two solutions of the equation AX + by = 15, find the values of a and B. y = 5, y = 10
6. X-30% x = 7, (1 + 35%) x = 270%, 15-10% x = 1 The process. Thank you
7. Given that point a (3x-6,4y + 15) and point B (5Y, x) are symmetric about the X axis, what is the value of X + y?
8. If x + y = 5 is known, then x + y + 6 = 5 + 6 = 11; if x + y + 6 = 15 is known, then x + y = 9. In the above operations, the whole idea is reflected, and here x + y can be used As a whole Given that the square of 2x + 3x = 5, then the square of 2x + 3x + 1= (2) Given that the square of x-2x-5 = 0, then the square of 2x-4x-5= (3) Given a + B = 3, ab = - 2, find the value of - 2 (a + AB) + (ab-2b) + 1
9. If we know x + y = 5, then x + y + 6 = 5 + 6 = 11; if we know x + y + 6 = 15, then x + y = 5, the above operations reflect the overall idea, we can regard x + y as Given a + B = a, ab = a + 2011, 1-2 (a + AB) + (ab-2b) = 3A, you can determine the value of a + B and AB, if you can find the value
10. Define new operation; known; # satisfy 4 # 1 = 15,5 # 4 = 11,8 # 6 = 48, then; 10 # 9=（
11. Find the next number Such as the title
12. Numerical reasoning: 5,7,10,15, (), 35. What should be filled in the blank?
13. Number reasoning: 1,1,2,3,8,7 () () 35,21
14. Number reasoning: 2,3,10,15,26,35, (), what are the results and reasons
15. Numerical reasoning 3 / 8,15 / 24,35 / 48, ()
16. Two civil servants' number reasoning questions 26 13 24 41 (), 15 3 1 3 / 8 3 / 25 ()
17. The number reasoning problem is as follows: - 1 10 6 19 17 ()
18. Number reasoning problem: - 2,1,0,2,2,6, ()
19. 1/3=2:( )=4/( ) =( )/15=6/( ) One third = 2 over () = 4 divided by () = fifteen parts () = () six parts
20. 4 / 6 + 2 / 6-15 / 20 =?