HOC24
Lớp học
Môn học
Chủ đề / Chương
Bài học
A=1+12+13+14+⋯+12100−1=1+12+(13+14)+(15+⋯+18)+(19+⋯+116)+⋯+(1299+1+⋯+12100)−12100=1+12+(12+1+122)+(122+1+⋯+123)+(123+1+⋯+124)+⋯+(1299+1+⋯+12100)−12100>1+12+2.122+22.123+23.124+⋯+299.12100−12100=1+12+12+⋯+12−12100=1+100.12−12100=1+50−12100=50+1−12100>50𝐴=1+12+13+14+⋯+12100−1=1+12+(13+14)+(15+⋯+18)+(19+⋯+116)+⋯+(1299+1+⋯+12100)−12100=1+12+(12+1+122)+(122+1+⋯+123)+(123+1+⋯+124)+⋯+(1299+1+⋯+12100)−12100>1+12+2.122+22.123+23.124+⋯+299.12100−12100=1+12+12+⋯+12−12100=1+100.12−12100=1+50−12100=50+1−12100>50
Vậy A>50.