Răspunsuri

2014-10-04T16:24:10+03:00
  \frac{1}{4} <  \frac{x+1}{18}< \frac{4}{9}   ??
Aducem toata inecuatia la acelasi numitor, dupa care acesta se anuleaza:
 \frac{9}{36} <  \frac{2(x+1)}{36} <  \frac{16}{36} |:36
9<2(x+1)<16 \\ &#10;9<2x+2<16&#10;
x ∈ {4,5,6}