Intervalle

Question

Si \(x∈[−10;−1]\), à quel intervalle appartient \(\frac{1}{x}\)?\(\)

Solution

\(\frac{1}{x}\in[-1 ;-0,1]\)

Question

Si \(x∈[4;+∞[\), à quel intervalle appartient \(\frac{1}{x}\) ?\(\)

Solution

\(\frac{1}{x}\in]0 ;\frac{1}{4}]\)

Question

Si \(x<-1\) alors .....<\(\frac{1}{x}\)<⋯.

Solution

-1<\(\frac{1}{x}\)<0

Question

Si \(1≤x≤2\) alors .....\(\le\frac{1}{x}\le\)⋯.

Solution

\(\frac{1}{2}\le\frac{1}{x}\le\frac{1}{1}\)

\(0,5\le\frac{1}{x}\le1\)