1 ) б :
[tex]\displaystyle\bf\\1 \ ; \ 3 \ ; \ 9 \ ; \ 27 \ ; \ ...\\\\\\q=\frac{3}{1} =\frac{9}{3} =\frac{27}{9} = 3\\\\\\Otvet \ : \ q=3\\\\\\2)\\\\b_{1} =2\\\\q=-3\\\\b_{4} =b_{1} \cdot q^{3} =2\cdot(-3)^{3} =2\cdot(-27)=-54\\\\Otvet \ : \ b_{4} =-54[/tex]
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1 ) б :
[tex]\displaystyle\bf\\1 \ ; \ 3 \ ; \ 9 \ ; \ 27 \ ; \ ...\\\\\\q=\frac{3}{1} =\frac{9}{3} =\frac{27}{9} = 3\\\\\\Otvet \ : \ q=3\\\\\\2)\\\\b_{1} =2\\\\q=-3\\\\b_{4} =b_{1} \cdot q^{3} =2\cdot(-3)^{3} =2\cdot(-27)=-54\\\\Otvet \ : \ b_{4} =-54[/tex]