Tính B =-1/3+1/3^2-1/3^3+…+1/3^100-1/3^101 22/11/2021 Bởi Adalynn Tính B =-1/3+1/3^2-1/3^3+…+1/3^100-1/3^101
B= -1/3+1/3^2-1/3^3+…+1/3^100-1/3^101 3B= -1+1/3-1/3^2+…+1/3^99-1/3^100 3B+B=4B=-1-1/3^101 =>B=(-1-1/3^101)/4 Vậy B=(-1-1/3^101)/4 Bình luận
B= -1/3+1/3^2-1/3^3+…+1/3^100-1/3^101
3B= -1+1/3-1/3^2+…+1/3^99-1/3^100
3B+B=4B=-1-1/3^101
=>B=(-1-1/3^101)/4
Vậy B=(-1-1/3^101)/4