[(A+B)+(C+D)]-(B+C)=(A+D)
=124+124-128
=120
[(B+C)+(D+E)]-(C+D)=(B+E)
=128+119-124
=123
[(C+D)+(E+F)]-(D+E)=(C+F)
=123+117-119
=122
答:(A+D)=120、(B+E)=123、(C+F)=122