b, (112005 + 112004) : 112003
= ( 112005 : 112003 ) : ( 112005 : 11 2003)
= (112005 - 2003) : ( 112004-2003)
=112 : 111 = 112-1=111=11
a)4.52-3.22+39:37
=4.25-3.4+32
=100-12+9
=97
b)(112005+112004):112003
=112005:112003+112004:112003
=112+11
=121+11
=132