1)
2)
8 6/21 +(-11,4) +2 5/7=
174/21 -114/10 +19/7=
174/21 -114/10 +57/21=
231/21 -114/10 =
2310/210-2394/210=
-84/210=-12/30=-4/6
1)![8\frac{2}{7}+(-11,4)=8\frac{2}{7}-11,4=\frac{58}{7}-11\frac{4}{10}=\frac{58}{7}-11\frac{2}{5}=\frac{58}{7}-\frac{57}{5}=\frac{290-399}{35}=-\frac{109}{35}=-3\frac{4}{35}](/tpl/images/0042/9424/8acb2.png)
2)![-3\frac{4}{35}+2\frac{5}{7}=2\frac{5}{7}-3\frac{4}{35}=\frac{19}{7}-\frac{109}{35}=\frac{95-109}{35}=-\frac{14}{35}=-\frac{2}{5}=-0,4](/tpl/images/0042/9424/c2502.png)
8 6/21 +(-11,4) +2 5/7=
174/21 -114/10 +19/7=
174/21 -114/10 +57/21=
231/21 -114/10 =
2310/210-2394/210=
-84/210=-12/30=-4/6