28:2=14
14-8=6 - ширина
6 × 8 = 48 - площадь
Р=(а+в)*2
8=(1+3)*2
10=(1+4)*2
10=(2+3)*2
14=(1+6)*2
14=(2+5)*2
14=(3+4)*2
<span>3^х-3^х-3=-78
3 (1^x - 1^x - 1) = -78
</span>
<span>1^x - 1^x - 1 = -78 / 3
</span><span>1^x - 1^x - 1 = -26
</span>
<span><span>1^x - 1^x = -26</span> + 1
</span><span>1^x - 1^x = -25
</span>