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(a) [(-16)x(-9)] ÷ 36
= 144 ÷ 36
= 4
(b) 28 - (-56 ÷ 8) + (-50)
= 28 - (-7) - 50
= 28 + 7 - 50
= -15
(c) [32 ÷ (-8)] x (-5)
= -4 x -5
= 20
(d) [(-18) x (-16)] + [(-28) ÷ 4]
= 288 + (-7)
= 288 - 7
= 281
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