Răspunsuri

2014-08-11T11:35:40+03:00
Ma=(a+b+c)/3=600

a+b+c=3*600

a+b+c=1800

ma2=(a+b)/2=220

a+b=2*220

a+b=440

c=1800-440
c=1360

a= 1/5 *c=  1/5 *1360=  272

b=440-272
b=168