Thực hiện phép tinh a, 24: {390: [500- (160+30.7)]} b, 120- [98 – 16- 9 mu 2)]

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1. a, 24:{390:[500-(160+30.7)]}

   =24:{390:[500-(160+210)]}

   =24:{390:[500-370]}

   =24:{390:130} =24:3=8

   b, 120-[98-16-9∧2]

   =120-[98-16-81]

   =120-[82-81]

   =120-1=119

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2. a) $24:{390:[500-(160+30.7)]}$

   $=24:{390:[500-(160+210)]}$

   $=24:{390:[500-370]}$

   $=24:{390:130}$

   $=24:3$

   $=8$

   b) $120-[98-16-(9^2)]$

   $=120-[98-16-81]$

   $=120-1$

   $=119$

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