Tìm số nguyên x, biết (-12/27 + 2/3) + -2/9 nhỏ hơn hoặc bằng x

* Hướng dẫn giải

$\begin{array}{l}\left(\frac{-12}{27}+\frac{2}{3}\right)+\frac{-2}{9}\le x\le \left(\frac{11}{7}+\frac{2}{5}\right)+\frac{-7}{5}+\frac{3}{7}\\ \Rightarrow \frac{-4}{9}+\frac{-2}{9}+\frac{2}{3}\le x\le \frac{11}{7}+\frac{2}{5}+\frac{-7}{5}+\frac{3}{7}\\ \Rightarrow \frac{-2}{3}+\frac{2}{3}\le x\le \left(\frac{11}{7}+\frac{3}{7}\right)+\left(\frac{2}{5}+\frac{-7}{5}\right)\\ \Rightarrow 0\le x\le 2+\left(-1\right)\\ \Rightarrow 0\le x\le 1\\ \Rightarrow x=1\end{array}$