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

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

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
1-2(a+ab)+(ab-2b)
=1-2a-2ab+ab-2b
=1-2(a+b)-ab
=1-2A-A-2011
=-3A-2010
-3A-2010=3A
6A=-2010
A=-335
a+b=-335
ab=1676