2 câu trả lời
B=120+130+142+156+172+190+1110
=14.5+15.6+16.7+17.8+18.9+19.10+110.11
=14-15+15-16+16-17+17-18+18-19+19-110+110-111
=14-111
=744
B=120+130+142+156+172+190+1110
=14.5+15.6+16.7+17.8+8.9+19.10+110.11
=14-15+15-16+16-17+17-19+19-111/10-111
=14-111
=744