\[5x^{2} - 7x + 2 < 0\]
\[D = 49 - 40 = 9\]
\[x_{1} = \frac{7 + 3}{10} = 1;\]
\[x_{2} = \frac{7 - 3}{10} = \frac{4}{10} = 0,4.\]
\[5(x - 0,4)(x - 1) < 0\]
\[0,4 < x < 1.\]
\[Ответ:0,4 < x < 1.\]