1993×199.2-1992×199.1=( )

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1993×199.2-1992×199.1=()1993×199.2-1992×199.1=()1993×199.2-1992×199.1=()1993×199.2-1992×199.1=(199.3

1993×199.2-1992×199.1=( )
1993×199.2-1992×199.1=( )

1993×199.2-1992×199.1=( )
1993×199.2-1992×199.1
=(199.3×1992-1992×199.1)
=1992×(199.3-199.1)
=1992×0.2
=398.4

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