2/7 ( 1,4 а- 3 1/2 в) - 1.2 (5/6 а - 0,5 в) - упростить

0.4а-в-а+0.6в=-0.6а-0.4в

[latex]\frac{2}{7}*(1,4a-3\frac{1}{2}b)-1,2*(\frac{5}{6}a-0,5b)[/latex] = [latex]\frac{2}{7}*(1,4a-\frac{7}{2}b)-1,2*(\frac{5}{6}a-0,5b)[/latex] = [latex]\frac{2}{7}*1,4a-\frac{7}{2}b*\frac{2}{7}-1,2*(\frac{5}{6}a-0,5b)[/latex] = [latex]0,4a-b-1,2*(\frac{5}{6}a-0,5b)[/latex] = [latex]0,4a-b-1,2*\frac{5}{6}a-0,5b*(-1,2)[/latex] = [latex]0,4a-b-a-0,5b*(-1,2)[/latex] = [latex]0,4a-b-a+0,6b[/latex] = [latex]0,4a-a-b+0,6b[/latex] = [latex]-0,6a-0,4b[/latex]