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Aflati numerele naturale 5a+2b=19. 5a-b=13

Răspuns :

5a=b+13
b+13+2b=19
3b=19-13
3b=6\÷3
b=2
5a=2+13
5a=15
a=3

5a+2b=19

5a-b=13

_______(-)

3b=6

b=2

5a+2x2=19

5a+4=19

5a=15

a=5