Question

a+b+c+d=44,a+b+c=31,b+c+d=30,b:c=2 rest 2 sa se afle a,b,c=? merci

Answer 1

a+b+c+d=44            Irelatie
a+b+c=31
inlocuim in I relatie si avem
31+d=44
d=44-31
d=13

b+c+d=30 inlocuim in I relatie si avem
a+30=44
a=44-30
a=14

b:c=2 rest 2
b=2c+2
inlocuim in relatia b+c+d=30
2c+2+c+13=30
3c+15=30
3c=30-15
c=15/3
c=5

b=2c+2=2x5+2
b=12