Помогите ! Срочно , пожалуйста

$a)$ $2<5$ + $3<6$ = $5<11$

б) -9" alt="0>-9" align="absmiddle" class="latex-formula"> + 1" alt="2>1" align="absmiddle" class="latex-formula"> = -8" alt="2>-8" align="absmiddle" class="latex-formula">

в) -5" alt="-4,1>-5" align="absmiddle" class="latex-formula"> + 4,1" alt="5>4,1" align="absmiddle" class="latex-formula"> = -0,9" alt="0,9>-0,9" align="absmiddle" class="latex-formula">

г) $-2\frac{2}{3}<-2\frac{1}{3}$ + $\frac{1}{6}<\frac{1}{3}$ = $-2\frac{1}{2}<-2$