-(0.4) во 2 степени :(1.4-1 3/7)

[latex] -0,4^{2} = 0,16[/latex] [latex]1 \frac{3}{7} = \frac{10}{7} [/latex] [latex]1.4 = \frac{7}{5} [/latex] получаем [latex] \frac{7}{5} - \frac{10}{7} = \frac{49}{35}- \frac{50}{35} = - \frac{1}{35} [/latex] далее [latex]\frac{16}{100}/ -\frac{1}{35} = \frac{16}{100} *-35 = -56[/latex]