Question

Ana ,Diana si Corina au decupat stelute.
Ana si Diana =60 stelute
Diana si Corina=68 stelute
Ana si Corina=76 stelute
Cate stelute au decupat fiecare?

Answer 1

a=ana
d=diana
c=corina
a;d;c;=? stelute
a+d=60 stelute
d+c=68 stelute
a+c=76 stelute
a+c=76
d+c=68
________
a+d+2c=144
60+2c=144
2c=144-60
2c=84
c=84:2
Corina=42 stelute
d+c=68
d+42=68
d=68-42
Diana=26 stelute
a+d=60
a+26=60
a=60-26
Ana=34 stelute
proba
a+d=34+26=60
d+c=26+42=68
a+c=34+42=76