••••Помогите пожалуйста•••• =}

Решите задачу:

$1. \\ ( \frac{7}{12}+ \frac{3}{8})*3=( \frac{14+9}{24})*3= \frac{23}{24}*3= \frac{23}{8} =2,875 \\ \\ 2. \\ 1-b^2\ \textless \ 0 \\ -b^2\ \textless \ -1 \\ b\ \textgreater \ 1 \\ ---2)--- \\ \\ 3. \\ 30 \sqrt{2}-(5+3 \sqrt{2})^2= \\ =30 \sqrt{2}-(25+30 \sqrt{2}+18)= \\ =30 \sqrt{2}-25-30 \sqrt{2}-18= \\ =-43$