Răspunsuri

  • Utilizator Brainly
2014-10-06T18:28:15+03:00
A+b=3971
a-b=7=>a=b+7

b+7+b=3971
2b+7=3971
2b=3964
b=1982

a=1982+7
a=1989

Verificare : 1989+1982=3971
2014-10-06T18:29:15+03:00
X+Y=3871
X-Y=7 DE UNDE REZULTA CA X=Y+7

Y+7+Y=3971
2Y=3871-7=3864
Y=1932
X=1939