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A+b+c=96; a+b=53; b+c=74; a,b,c=?

Răspuns :

a+b+c=96
a+b=53
b+c=74
53+c=96
c=96-53
c=43
b+43=74
b=74-43
b=31
a+31=53
a=53-31
a=22
V: 22+31+43=96
R: a=22  ;  b=31  ; c=43
a+b=53 si a+b+c=96 => c=96-53=43 b+43=74=>b=74-43=31 a+31=53=>a=53-31=21