<span>11+2,3х+1,3х=38</span>
<span>11+3,6х=38</span>
<span>3,6х=38-11</span>
<span>3,6х=27</span>
<span>х=27/3,6</span>
<span>х=7,5.</span>
<span>Проверка</span>
<span>11+2,3*7,5+1,3*7,5=38</span>
<span>11+17,25+9,75=38</span>
<span>28,25+9,75=38</span>
<span>38=38.</span>
<span>Ответ:7,5</span>
0,1d(2d2−3)(3d2+6)=0,1d(6d^4+12d^2-9d^2-18)=
=0,1d(6d^4+3d^2-18)=0,6d^5+0,3d^3-1,8
Ответ:
Объяснение:
Смотрите. .......
(2х+1)(х+4)=2х^2+8x+x+4=2x^2+9x+4