Răspunsuri

2014-11-03T15:35:57+02:00
1.
a+b=284,b+c=263⇒a+2b+c=547;a+b+c=504⇒b=547-504=43
b=43⇒a=284-43=241
b=43⇒c=263-43=220.
2.
a+b=30,a+c=40,b+c=50⇒2a+2b+2c=120⇒a+b+c=120:2=60
a+b+c=60,a+b=30⇒c=60-30=30.
c=30,a+c=40⇒a=10
c=30,b+c=50⇒b=20.