Tìm x thuộc Z, biết: a) 5/3 + -14/3 < x < 8/5 + 4/10 b) 1/5 + 2/25

* Hướng dẫn giải

a) 

$$\begin{gathered} \frac{5}{3}+\frac{-14}{3}<x<\frac{8}{5}+\frac{4}{10} \\ \begin{array}{l}\iff -3<x<2\\ x\in \left\{-2;-1;0;1\right\}\end{array} \end{gathered}$$

b) 

$$\begin{gathered} \frac{1}{5}+\frac{2}{35}<x<\frac{-3}{7}+\frac{4}{5} \\ \begin{array}{l}\iff \frac{9}{35}<x<\frac{13}{35}\\ x\in \left\{\varnothing \right\}\end{array} \end{gathered}$$