<span>12-40:k=4</span>
<span>40:k=8</span>
<span>k=5
(30-n):2=9</span>
<span>30-n=18</span>
<span>n=12
7*b-15=6</span>
<span>7b=21</span>
<span>b=3
20:(x:9)=4</span>
<span>x:9=5</span>
<span>x=45
(9*t+37):8=8</span>
9t+37=64
9t=27
t=3
Ответ: 22,11. Если до тысячных то 22,110
<span> 4т 500кг=4500кг=45ц..........................</span>
3,4/1,7=20 и 2,9/5,8=1/2
20*1/2=10
Ответ:10