1. Simplify the following mathematical
expressions using BODMAS.
a) 83 - [29 - {6=3-(6-9-3) - 3}]
b) [87 - 12 ÷ 3 of 4] + (37 - 29) X 4
c) 500 - [80 + {20 - (60 - 50)}]
d) (-21) ÷ [16+ (-13)] +(-5)
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