Tìm x, biết: \(x.\frac{9}{{ - 13}} = \frac{{ - 33}}{{26}}\)

* Hướng dẫn giải

Vì \(x.\frac{9}{{ - 13}} = \frac{{ - 33}}{{26}};\) nên \(x = \frac{{ - 33}}{{26}}:\frac{9}{{ - 13}};\)

Mà \(\frac{{ - 33}}{{26}}:\frac{9}{{ - 13}} = \frac{{ - 33}}{{26}}.\frac{{ - 13}}{9} = \frac{{\left( { - 33} \right).\left( { - 13} \right)}}{{26.9}} = \frac{{11.3.13}}{{2.3.3.13}} = \frac{{11}}{6};\)

Vậy \(x = \frac{{11}}{6}.\)