186)
$(200·10^6-3000·10^3+10^7) : 10^5$=
=$\frac{200·10^6}{10^5}-\frac{3000·10^3}{10^5}+\frac{10^7}{10^5}$=
=$200·10^{6-5}-3000·10^{3-5}+10^{7-5}$=
=$200·10^1 -3000·10^{-2}+10^2$=
=$2000-30+100$=
=$2070$.
Ma sono tutti simili!
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