Resposta:

[tex]a)\\ \\ (-5)^{3} .(-5).(-5)^{2} =(-5)^{3+1+2} =(-5)^{6} \\ \\ b)\\ \\ (+3).(+3).(+3)^{7} =(+3)^{1} .(+3)^{1} .(+3)^{7} =(+3)^{1+1+7} =+3^{9} \\ \\ c)\\ \\ (-6)^{2} .(-6)^{2} =(-6)^{2+2} =(-6)^{4} \\ \\ d)\\ \\ (+9)^{3} .(+9).(+9)^{4} =(+9)^{3} .(+9^{1} ).(+9)^{4}=(+9)^{3+1+4} =+9^{8}[/tex]