Tìm x a) 1 1/2 - (1/5 - x) = 0.3 b) - 3/5 + 1/5 : x = 0.75 : (-1 1/4)

Bài 2: tìm x

$$\begin{gathered} \mathrm{a}) 1\frac{1}{2} - \left(\frac{1}{5}-\mathrm{x}\right) =0,3 \\ \mathrm{b}) \frac{-3}{5}+\frac{1}{5}÷\mathrm{x} = 0,75 ÷\left(-1\frac{1}{4}\right) \\ \mathrm{c}) -0,25 \times \left(\mathrm{x}-\frac{2}{3}\right)=\frac{3}{4} \\ \mathrm{d}) \frac{4}{7}\mathrm{x} \times \left(\mathrm{x}-\frac{1}{4}\right) =0 \\ \mathrm{chú} \mathrm{ý}: \mathrm{x} \mathrm{là} \mathrm{giá} \mathrm{trị} \mathrm{cần} \mathrm{tìm} \\ \times \mathrm{là} \mathrm{dấu} \mathrm{nhân} \end{gathered}$$