Ответы на вопрос:
{a5-a1=15⇒a1*q^4-a1=15⇒a1*(q^4-1)=15⇒a1=15/(q^4-1) {a4-a2=6⇒a1*q³-a1*q=6⇒a1*q(q²-1)=6⇒a1=6/q(q²-1) 15/(q²-1)(q²+1)=6/q(q²-1) 5/(q²+1)=2/q.q≠+-1 2q²+2=5q 2q²-5q+2=0 d=25-16=9 q1=(5-3)/4=1/2⇒a1=15: (1/16-1)=15: (-15/16)=-15*16/15=-16 q2=(5+3)/4=2⇒a1=15/(16-1)=15/15=1 ответ1)a1=-16,q=1/2; 2)a1=1,q=2
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