1)48*3=144(кг)-48 банок
2)144-54=90(кг)- на 2 дом
(38,3+37,9+38,6+38+37,7)/5=38,1
<span>15-72:(а-3)=9
15-72/a-3 =9
15-72/a-3 =9, a</span>≠3
-72/a-3 =9-15
-72/a-3=-6
-72=-6(a-3)
-72=-6a+18
6a=18+72
6a=90
a=90/6
a=15 , a≠3
Ответ: 15
Пусть x - шаг прогрессии. Тогда
![\begin{cases}3t+5=t^2-2t+x\\2t^2-t+25=4t+13+x\end{cases}\Rightarrow\begin{cases}x=-t^2+5t+5\\2t^2-t+25=4t+13+\left(-t^2+5t+5\right)\end{cases}\\\\2t^2-t+25=4t+13+\left(-t^2+5t+5\right)\\2t^2-t+25=4t+13-t^2+5t+5\\2t^2-t+25=-t^2+9t+18\\3t^2-10t+7=0\\D=100-4\cdot3\cdot7=100-84=16\\t_{1,2}=\frac{10\pm4}6\\t_1=1,\;t_2=\frac73\\\\\begin{cases}x_1=11\\t_1=1\end{cases}\quad\quad\quad\begin{cases}x_2=11\frac29\\t_2=\frac73\end{cases}](https://tex.z-dn.net/?f=%5Cbegin%7Bcases%7D3t%2B5%3Dt%5E2-2t%2Bx%5C%5C2t%5E2-t%2B25%3D4t%2B13%2Bx%5Cend%7Bcases%7D%5CRightarrow%5Cbegin%7Bcases%7Dx%3D-t%5E2%2B5t%2B5%5C%5C2t%5E2-t%2B25%3D4t%2B13%2B%5Cleft%28-t%5E2%2B5t%2B5%5Cright%29%5Cend%7Bcases%7D%5C%5C%5C%5C2t%5E2-t%2B25%3D4t%2B13%2B%5Cleft%28-t%5E2%2B5t%2B5%5Cright%29%5C%5C2t%5E2-t%2B25%3D4t%2B13-t%5E2%2B5t%2B5%5C%5C2t%5E2-t%2B25%3D-t%5E2%2B9t%2B18%5C%5C3t%5E2-10t%2B7%3D0%5C%5CD%3D100-4%5Ccdot3%5Ccdot7%3D100-84%3D16%5C%5Ct_%7B1%2C2%7D%3D%5Cfrac%7B10%5Cpm4%7D6%5C%5Ct_1%3D1%2C%5C%3Bt_2%3D%5Cfrac73%5C%5C%5C%5C%5Cbegin%7Bcases%7Dx_1%3D11%5C%5Ct_1%3D1%5Cend%7Bcases%7D%5Cquad%5Cquad%5Cquad%5Cbegin%7Bcases%7Dx_2%3D11%5Cfrac29%5C%5Ct_2%3D%5Cfrac73%5Cend%7Bcases%7D)
Наименьшее t = 1.