Tính nhanh: (-134) + 51.134 + (-134).48

\[\,\,\,45.{\rm{ }}\left( { - 24} \right){\rm{ }} + {\rm{ }}\left( { - 10} \right).\left( { - 12} \right)\] \[ = {\rm{ }}45.{\rm{ }}\left( { - 24} \right){\rm{ }} + {\rm{ }}\left( { - 5} \right).2\left( { - 12} \right)\] \[ = {\rm{ }}45.{\rm{ }}\left( { - 24} \right){\rm{ }} + {\rm{ }}\left( { - 5} \right).\left( { - 24} \right)\]

 \[ = {\rm{ }}\left( { - 24} \right).\left( {{\rm{ }}45 - 5} \right)\;\] \[ = {\rm{ }}\left( { - 24} \right).{\rm{ }}40\] \[ = {\rm{ }} - {\rm{ }}960\]

\[{\rm{ }}\left( { - 41} \right){\rm{ }}\left( {59 + 2} \right){\rm{ }} + {\rm{ }}59\left( {41 - 2} \right)\] \[ = {\rm{ }}\left( { - 41} \right).59{\rm{ }} + {\rm{ }}\left( { - 41} \right).2{\rm{ }} + {\rm{ }}59.41{\rm{ }} - {\rm{ }}59.2\] \[ = {\rm{ }}\left[ {\left( { - 41} \right).59{\rm{ }} + {\rm{ }}59.41} \right]{\rm{ }} + {\rm{ }}\left[ {\left( { - 41} \right).2\; - {\rm{ }}59.2} \right]\] \[ = {\rm{ }}0{\rm{ }} + {\rm{ }}2{\rm{ }}\left( { - {\rm{ }}41{\rm{ }} - {\rm{ }}59} \right)\]

\[ = {\rm{ }}2.\left( { - 100} \right){\rm{ }} = {\rm{ }} - 200\]