[tex]\displaystyle -4(-2)^-^3=-4(-2^-^3)=2^2*2^-^3=2^-^1=\frac{1}{2}=0,5[/tex]
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[tex]\displaystyle -4(-2)^-^3=-4(-2^-^3)=2^2*2^-^3=2^-^1=\frac{1}{2}=0,5[/tex]