[tex]\displaystyle\bf\\b_{1} =8\\\\q=0,5\\\\\\b_{3} =b_{1}\cdot q^{2} =8\cdot 0,5^{2} =8\cdot 0,25=2\\\\\\Otvet:b_{3} =2[/tex]
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[tex]\displaystyle\bf\\b_{1} =8\\\\q=0,5\\\\\\b_{3} =b_{1}\cdot q^{2} =8\cdot 0,5^{2} =8\cdot 0,25=2\\\\\\Otvet:b_{3} =2[/tex]