[(-11/4):(-11/8)-(7/2):(7/4)}^2013= [(8/4)-(4/2)]^2013= (2-2)^2013= (0)^2013= =0

[(-2 3/4) :(-11/8) -( +3 1/2) :7/4]^2013 = = [-11/4 :(-11/8) - 7/2 : 7/4]^2013 = = [ -11/4 ×( -8/11) - 7/2 × 4/7] ^2013 = = (2 - 2)^2013 = = 0^2013 = = 0