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2014-11-02T23:05:26+02:00
A+b+c=7,5
b=0,8+a
(b+c):2=3 |x2 |=> b+c=6
a+6=7.5
a=7,5-6
a=1,5
b=0,8+a
b=0,8+1,5
b=2.3
2,3+c=6
c=6-2,3
c=3,7
2014-11-02T23:11:20+02:00
A+b+c =7,5

a=7,5-b-c
(b+c) : 2 = 3
b+c=6
b=6-c

a= 7,5-(6-c)-c= 7,5-6+c-c = 1,5
b=1,5+0,8=2,3
c=6-b= 6-2,3 = 3,7