70×〔(42-42)÷18〕
=70×(0÷18)
=70×0
=0
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
=708
81÷[(72-54)×9]
=81÷(18×9)
=81÷162
=0.5
960÷(1500-32×45)
=960÷(1500-1440)
=960÷60
=16
20道，脱式计算，题的答案。
