(1,0 điểm) Tính hợp lí biểu thức sau: a) 1024 : ( − 2 ) 6 + 160 : ( − 3 3 − 53 ) − 9 0 ⋅ 9 1 . b) − 138 ⋅ 2 + 125 ⋅ 3 − ( − 138 ⋅ 2 ) + 75 ⋅ 3.

a) \(1024:{\left( { - 2} \right)^6} + 160:\left( { - {3^3} - 53} \right) - {9^0} \cdot {9^1}\)

\( = {2^{10}}:{2^6} + 160:\left( { - 27 - 53} \right) - 9\)

\( = {2^4} + 160:\left( { - 80} \right) - 9\)

\( = 16 + \left( { - 2} \right) - 9\)

\( = 5.\)

b) \( - 138 \cdot 2 + 125 \cdot 3 - \left( { - 138 \cdot 2} \right) + 75 \cdot 3\)

\( = \left[ { - 138 \cdot 2 - \left( { - 138 \cdot 2} \right)} \right] + \left( {125 \cdot 3 + 75 \cdot 3} \right)\)

\( = 0 + 3 \cdot \left( {125 + 75} \right)\)

\( = 0 + 3 \cdot 200\)

\( = 0 + 600\)

\( = 600.\)