Thực hiện phép tính:

a) 125 : 25 + 12.4

b) 25 – (62 – 75) + (-38)

c) 2680 + [10.(4³ – 54):5² + 2⁴]

 

a)

\(\begin{array}{l}\,\,\,\,125:25 + 12.4\\ = 5 + 48\\ = 53\end{array}\)

b)

\(\begin{array}{l}\,\,\,\,25 - \left( {62 - 75} \right) + \left( { - 38} \right)\\ = 25 - \left( { - 13} \right) - 38\\ = 25 + 13 - 38\\ = 38 - 38\\ = 0\end{array}\)

c)

\(\begin{array}{l}\,\,\,\,2680 + \left[ {10.\left( {{4^3}--54} \right):{5^2} + {2^4}} \right]\\ = 2680 + \left[ {10.\left( {64--54} \right):25 + 16} \right]\\ = 2680 + \left( {10.10:25 + 16} \right)\\ = 2680 + \left( {100:25 + 16} \right)\\ = 2680 + \left( {4 + 16} \right)\\ = 2680 + 20\\ = 2700\end{array}\)