Ответы на вопрос:
(m+1)! /(m-1)! =30,
(m+1)! =1*2**(m-2)*(m-1)*m*(m+1),
(m-1)! =1*2**(m-2)*(m-1),
m(m+1)=30,
m^2+m-30=0,
по теореме виета
m_1=-6< 0, m_2=5;
m=5;
(k+1)! /k! =12,
(k+1)! /k! =1*2**(k-1)*k*(k+1)/(1*2**(k-1)*k)=k+1,
k+1=12,
k=11.
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