Explicație pas cu pas:
d=42.511.
c-42.511=3.608
c=42.511+3.608=56.119
b-56.119=93.104
b=93.104+56.119=149.223
a-149.223=18.275
a=149.223+18.275=167.498
42.511+ 98.620+ 247.843+
56.119 149.223 167.498
------------- --------------- --------------
98.620 247.843 415.341
