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4- Δ=5-1 ;3-Δ=3-1;Δ-1=7+1;

Răspuns :

4-delta=5-1;4-delta=4;delta=8. 3-delta=3-1;3-delta=2;delta=2+3=5 delta-1=7+1;delta-1=8;delta=8+1=9