a, x: 8,5 = 0,69 : (-1,15)
=\(\dfrac{x}{8,5}\)=\(\dfrac{0,69}{-1,15}\)
\(\Rightarrow\)x= \(\dfrac{8,5\cdot0,69}{-1,15}\)=-5,1
b,(0,25x):3=\(\dfrac{4}{5}\): 0,125
=\(\dfrac{0,25x}{3}\)=\(\dfrac{32}{5}\)
\(\Rightarrow\)0,25x=\(\dfrac{3\cdot32}{5}\)=\(\dfrac{96}{5}\)
\(\Rightarrow\)x=\(\dfrac{96}{5}\): 0,25 =76,8