原式= 42.7*0.65+( )*10*42.7=42.7 0.65+( )*10=1 ( )*10=0.35 ( )=0.0350.035
0.035
42.7×0.65+( )×427=42.7( )=(42.7-42.7×0.65)÷427 =(42.7-27.755)÷427 =14.945÷427 =0.035