Tìm x biết rằng: ​\(8\dfrac{1}{5}x\left( {11\dfrac{{94}}{{1591}} - 6\dfrac{{38}}{{1517}}} \right):8\dfrac{{11}}{{43}} = 75\%\)

* Hướng dẫn giải

Ta có:

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