Tìm \(x\) biết: \(\left( {\frac{{15}}{{10}}x + 25} \right):\frac{2}{3} = 60\)

* Hướng dẫn giải

\(\begin{array}{l}\,\left( {\frac{{15}}{{10}}x + 25} \right):\frac{2}{3} = 60\\\,\,\,\,\,\,\left( {\frac{3}{2}x + 25} \right):\frac{2}{3} = 60\\\,\,\,\,\,\,\,\,\frac{3}{2}x + 25\,\,\,\,\,\,\,\,\,\, = 60.\frac{2}{3}\\\,\,\,\,\,\,\,\,\frac{3}{2}x + 25\,\,\,\,\,\,\,\,\,\, = 40\\\,\,\,\,\,\,\,\,\frac{3}{2}x\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = 40 - 25\\\,\,\,\,\,\,\,\,\frac{3}{2}x\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = 15\\\,\,\,\,\,\,\,x\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = 15:\frac{3}{2}\\\,\,\,\,\,\,\,x\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = 10\,\,\,\end{array}\)

Chọn D