Question

exercitiul 1 subpunctele b si c va rogg mult

Answer 1

Răspuns:

b) (1/6;1/5]....(-17/6; -14/5}

c) 3n+1

Explicație pas cu pas:

x∈[5.6) deci 1/x∈(1/6;1/5]

[1/x-3]∈=(-1/6-3; 1/5-3]=(-17/6; -14/5}

c) asta  e si mai greu...

dar..

[ n+1+n+2√(n²+2n)]=2n+1+[√(n²+2n)]

dar n=\n|=√n²<√(n²+2n)<√(n²+2n+1)=|n+1|=n+1

deci 2n+1+[√(n²+2n)]=2n+1+n=3n+1`