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a+ b+c=?
a+c=25
a+b=19
b+c=20
Cat e fiecare?



Răspuns :

2a+2b+2c=64
2(a+b+c)=64
a+b+c=32
19+c=32
c=13
a+13=25
a=12
b+13=20
b=7
2a+2b+2c=25+19+20=64
a+b+c=64:2
a+b+c=32

a+c=25
b=32-25
b=7

b+c=20
c=20-7
c=13

a+b=19
a=19-7
a=12