X-35 + 8 = 15 to solve the equation

X-35 + 8 = 15 to solve the equation

x-35+8=15
x=15+35-8
x=42

If x + y = 5, then x + y + 6 = 11, on the contrary, if x + y + 6 = 11, then x + y = 5. In the above operation, it reflects a kind of overall idea, here "x + Y" can be regarded as a "whole". Try the following calculation: (1) given x2-2x-5 = 0, then 2x2-4x-5=______ (2) given 3x + 4y-6x-1-y = 0, then X-Y=______ (3) given that a + B = a, ab = a + 2011, 1-2 (a + AB) + (ab-2b) = 3A, can you determine the value of a + B and ab? If you can, request their values

(1) In this paper, we will get the X-Y = - 13 from the solution of X-Y = -13; the answer is: (1) 5; (2) the answer is: (1) 5; (2) the answer is: (1) 5; (2) - 13; (3) the answer is: (1) 5; (2) - 13; (3) 1-2 (a + AB) + (ab-2b) + (ab-2b) = 1-2a-2a-2a-2a-2b + ab-2b-ab-2b = 1-2a-2a-2a-2a-2a-2a-2a-2a-2b + ab-2b-2b-ab-2b-ab-2b = 1-2 (a-2a-2a-2a-2a-2a-2011-2011-2011-2011-a-2011-a-2011-2011-a-2011-2011-2011-a-2011-2011-a-2011-a-2011-2011-a-a-a-2011-a-2011-a-a-a-2011-a-a-2011-a-2011-a-a-a-2011-so, a + B = - 335, ab = - 3 35+2011=1676．

Six out of eleven x seven out of fifteen x 10 =? (those that can be easily calculated should be easily calculated

If six out of eleven times seven out of fifteen times ten, seven out of fifteen times ten can be calculated first, and then multiplied by six out of eleven. In the process of calculation, the result is twenty-eight out of eleven