直接写得数。

2×3×7=                            36÷9×8=                         72- 8÷3=                      27×3+18 =   

27÷3×6=                          20÷5×3=                         8×3÷4=                       56 - 24÷3 =    

21÷7×4=                          3×2×9=                           56÷7÷2=                     30÷6×5=   

9×9-40=                            24÷6+50 =                         8×3-20=                       3×5-15 =

长输管线项目公司专职巡检员必须作到的“五清”是什么？