156×[(17.7-7.2)÷3] =156×(10.5÷3)=156×3.5=546[37.85-(7.85+6.4)] ×30 =(37.85-7.85-6.4)×30=(30-6.4)×30=23.6×30=70881÷[(72-54)×9] =81÷(18×9)=81÷162=0.5960÷(1500-32×45) =960÷(1500-1440)=960÷60=16