0,125*1/4=1/2-х х-0,12*2/5=16*1/2

[latex]0,125 = \frac{125}{1000} = \frac{25}{200} = \frac{5}{40} = \frac{1}{8} [/latex]   [latex]0,12 = \frac{12}{100} = \frac{6}{50} = \frac{3}{25}[/latex]   [latex]\frac{1}{8} * \frac{1}{4} = \frac{1}{2} -x [/latex]   [latex]\frac{1}{32} - \frac{1}{2} = x[/latex]   [latex] \frac{1}{32} = \frac{1}{2} - x [/latex]   [latex]\frac{1}{32} - \frac{1}{2} = \frac{1-16}{32} = -\frac{15}{32} [/latex]   [latex]x = -\frac{15}{32}[/latex]