(1) Răspunsuri
a3=12=>a1+2*r=12=>a1=12-2*r a6=30=>a1+5*r=30 => 12-2*r+5*r=30=> 3*r=18=>r=6 a1=12-2*6=0 a10=a1+9*r=0+54=54
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a3=12=>a1+2*r=12=>a1=12-2*r a6=30=>a1+5*r=30 => 12-2*r+5*r=30=> 3*r=18=>r=6 a1=12-2*6=0 a10=a1+9*r=0+54=54