Tìm x biết: \( - = 75{\rm{\% }}}\)

* Hướng dẫn giải

 \(\begin{array}{*{20}{l}} {8\frac{1}{5}x\left( {11\frac{{94}}{{1591}} - 6\frac{{38}}{{1517}}} \right):8\frac{{11}}{{43}} = 75{\rm{\% }}}\\ {\frac{{41}}{5}x\left( {\frac{{17595}}{{1591}} - \frac{{9140}}{{1517}}} \right):\frac{{355}}{{43}} = \frac{3}{4}}\\ {\frac{{41}}{5}x.\frac{{8875}}{{1763}}.\frac{{43}}{{355}} = \frac{3}{4}}\\ {5{\rm{x}} = \frac{3}{4}}\\ {x = \frac{3}{{20}}} \end{array}\)