a_1*q^4=a^5
a_1*(-\frac{1}{3})^4=\frac{5}{27}
a_1*\frac{1}{81}=\frac{5}{27}/:\frac{1}{81}
a_1=\frac{5}{\not27^1}*\frac{\not81^3}{1}
a_1=15
a_2=15*q=\not15^5*(-\frac{1}{\not3^1})=5*(-1)=-5
a_3=a_2*q=-5*(-\frac{1}{3})=\frac{5}{3}
a_4=a_3*q=\frac{5}{3}*(-\frac{1}{3})=-\frac{5}{9}
a_5=a_4*q=-\frac{5}{9}*(-\frac{1}{3})=\frac{5}{27}