Câu trả lời:
58+524+548+...+552858+524+548+...+5528
A=52.4+54.6+56.8+...+522.24=52.4+54.6+56.8+...+522.24
=52.(22.4+24.6+26.8+...+222.24)=52.(22.4+24.6+26.8+...+222.24)
=52.(12−14+14−16+16−...−122+122−124)=52.(12−14+14−16+16−...−122+122−124)
=52.(12−124)=52.(12−124)
=52.1124=52.1124
=5548=5548.
vậy A = 5548