Question

В арифметической прогрессии
a17/a2=4 найдите a4/a11

Answer 1

 $\frac{a_{17}}{a_{2}} = \frac{a_{1}+16d}{a_{1}+d} =4 \\ 12d=3a_{1} \\ \frac{a_{1}+3d}{a_{1}+10d} = \frac{1}{2}$