[tex]\displaystyle\bf\\b_{1} =-27\\\\b_{2} =-9\\\\S=?\\\\\\b_{2} =b_{1} \cdot q\\\\q=b_{2} : b_{1} =-9:(-27)=\frac{1}{3} \\\\\\S=\frac{b_{1} }{1-q} =\frac{-27}{1-\frac{1}{3} } =-\frac{27}{\frac{2}{3} } =-\frac{27\cdot 3}{2} =-40,5\\\\\\Otvet \ : \ S=-40,5[/tex]
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[tex]\displaystyle\bf\\b_{1} =-27\\\\b_{2} =-9\\\\S=?\\\\\\b_{2} =b_{1} \cdot q\\\\q=b_{2} : b_{1} =-9:(-27)=\frac{1}{3} \\\\\\S=\frac{b_{1} }{1-q} =\frac{-27}{1-\frac{1}{3} } =-\frac{27}{\frac{2}{3} } =-\frac{27\cdot 3}{2} =-40,5\\\\\\Otvet \ : \ S=-40,5[/tex]