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a+b+c=60 a+2b=2+b+3c
a(b+c):2

Răspuns :

Primăvară2017
a+b+c=60

a+2b=2+b+3c
a+2b-b=2+3c
a+b=2+3c

a+b+c=60
2+3c+c=60
2+4c=60
2×(1+2c)=60
1+2c=60:3
1+2c=20
2c=20-1
2c=19
c=19:2
c=9 rest 1

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