380-(125+47)÷4 =380-172÷4 =380-43 =337 107×12+161÷23 =1284+7 =1291 471+102÷(61-44) =471+102÷17 =471+6 =477 (18+156÷13)×65 =(18+12)×65 =30×65 =1950 45×[900÷(32-17)] =45×[900÷15] =45×60 =2700