Giải bởi Vietjack
\[\left( { - {\rm{ }}4} \right).2.6.25.\left( { - 7} \right).5\;\;\] \[ = {\rm{ }}\left[ {\left( { - 4} \right).25} \right].\left( {2.5} \right).\left[ {6.\left( { - 7} \right)} \right]\] \[ = {\rm{ }}\left( { - 100} \right).10.\left( { - 42} \right)\] = 42000
