Răspuns :
B=28~2= 56
C=3~56= 168
D=(A+b)~2=(28+56)~2= 83~2= 166
A+B+c+d=28+56+168+166
C=3~56= 168
D=(A+b)~2=(28+56)~2= 83~2= 166
A+B+c+d=28+56+168+166
B=28×2
B=56
C=56×3
C=168
D=(28+56)×2
D=84×2
D=168
A+B+C+D=28+56+168+168
=84+168+168
=252+168
=320