Tính nhanh: A = 1995^2 - 1994.1996; B = 9^8.2^8 - (18^4 - 1)(18^4 + 1); C = 163^2 + 74.163 + 37^2; D = 1996^3 - 1/1996^2 + 1997

1. Tính nhanh:
a) A = 1995^2 - 1994.1996
b) B = 9^8.2^8 - (18^4 - 1)(18^4 + 1)
c) C = 163^2 + 74.163 + 37^2
d) D = 1996^3 - 1/1996^2 + 1997
2. Tìm x:
a) 2(x - 1)^2(x + 3)^2 = 3(x - 2)(x + 1)
b) (x + 2)^2 - 2(x - 3) = (x + 1)^2
c) (x - 1)^2 + (x - 2)^2 = 2(x + 4)^2 - (22x + 27)