Răspuns :
a+b+c/3=7.12
(a+b+c):3=7.12
a+b+c=7.12x3
a+b+c=21.36
a+b/2=6.4
(a+b):2=6.4
a+b=6.4x2
a+b=12.8
a+b+c=21.36
12.8+c=21.36
c=21.36-12.8
c=8.56
/=supra
(a+b+c):3=7.12
a+b+c=7.12x3
a+b+c=21.36
a+b/2=6.4
(a+b):2=6.4
a+b=6.4x2
a+b=12.8
a+b+c=21.36
12.8+c=21.36
c=21.36-12.8
c=8.56
/=supra