Đáp án đúng: B Giải chi tiết:\(\begin{array}{l}(x:5)\, - \,11 = 18,5\\\,\,x:5\,\,\,\,\,\,\,\,\,\,\,\, = \,\,18,5 + 11\\\,\,x:5\,\,\,\,\,\,\,\,\,\,\,\, = \,\,\,\,\,29,5\\\,\,x\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = \,\,\,\,\,29,5 \times 5\\\,\,x\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = \,\,\,\,\,\,\,147,5\end{array}\) Chọn B.
