[tex]\displaystyle\bf\\b^{-19} \cdot(-2b^{7} )^{3} =b^{-19} \cdot (-8b^{21} )=-8\cdot b^{-19+21} =-8b^{2} \\\\b=1,1\\\\-8b^{2} =-8\cdot 1,1^{2} =-8\cdot 1,21=-9,68\\\\Otvet: -9,68[/tex]
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[tex]\displaystyle\bf\\b^{-19} \cdot(-2b^{7} )^{3} =b^{-19} \cdot (-8b^{21} )=-8\cdot b^{-19+21} =-8b^{2} \\\\b=1,1\\\\-8b^{2} =-8\cdot 1,1^{2} =-8\cdot 1,21=-9,68\\\\Otvet: -9,68[/tex]