Tìm x thuộc Z, biết:

- Hướng dẫn giải

a) $\frac{5}{6}+\frac{1}{6}\le x\le \frac{13}{4}+\frac{14}{8}\iff 1\le x\le 5\iff x\in \left\{1;2;3;4;5\right\}$

b) $\frac{-5}{6}+\frac{8}{3}+\frac{29}{-6}\le x\le \frac{-1}{2}+2+\frac{5}{2}\iff -3\le x\le 4$$\iff x\in \left\{-3;-2;-1;0;1;2;3;4\right\}$

c) $\frac{79}{15}+\frac{7}{5}+\frac{-8}{3}\le x\le \frac{10}{3}+\frac{15}{4}+\frac{23}{12}$$\iff 4\le x\le 9\iff x\in \left\{4;5;6;7;8;9\right\}$