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[tex]1 \ m=100 \ cm\\\\1 \ m^3=(100 \ cm)^3=1 \ 000 \ 000 \ cm^3\\\\1 \ cm^3=0,000001 \ m^3\\\\125 \ cm^3=125\cdot0,000001 \ m^3=\boxed{0,000125 \ m^3}[/tex]