( )*0.85+( )*0.47 括号里只能填4.7、0.915、9.15和91.5,使算式简便
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( )*0.85+( )*0.47 括号里只能填4.7、0.915、9.15和91.5,使算式简便
( 4.7)*0.85+(91.5 )*0.47
=4.7*0.85+9.15*4.7
=4.7*(0.85+9.15)
=4.7*10
=47
( )*0.85+( )*0.47 括号里只能填4.7、0.915、9.15和91.5,使算式简便
( 4.7)*0.85+(91.5 )*0.47
=4.7*0.85+9.15*4.7
=4.7*(0.85+9.15)
=4.7*10
=47