Răspunsuri

2014-05-22T18:22:36+03:00
A+b+c/3=17=> a+b+c=3x17 =>a+b+c=51
c=15=> a+b+15=51=>a+b=51-15 =>a+b=36
2xa=b-3=>b=2a+3
a+2a+3=36
3a=36-3
3a=33
a=33/3
a=11
b=22+3
b=25
a+b+c totul supra 3=17
11+15+25 supra 3=17
51/3=17
17=17
2014-05-22T18:41:50+03:00
(a+b+c)/3=17
c=15
2a=b-3 ⇒ b=2a+3
(a+2a+3+15)/3=17
(3a+18)/3=17
3a+18= 3*17
3a=51-18
3a= 33
a=33/3
a=11
b=2a+3
b= 2*11+3
b= 22+3=25
a=11
b=25
c=15
verificare
(11+25+15)/3=17
51/3=17
17=17