(1)-20+(-14)-(-18)-13
=-20-14+18-13
=-29
(2)-81÷|-4分之9|×9分之4÷(-16)
=-81÷(-16)
=81/16
(3)【30-(9分之7+6分之5-12分之11)×(-36)】÷(-5)
=[30-(7/9+5/6-11/12)×(-36)]÷(-5)
=[30-(25/36)×(-36)]÷(-5)
=[30+25]÷(-5)
=-11
(4)-4+[1-(1-0.5÷3)]×|2-(-3)^2|
=-4+[1/6]×7
=-4+7/6
=-17/6