hay van dung ket qua phan a ma cac ban vua lam ra la A<1/2

chung to 1/3+2/3^3+3/3^3+4/3^4+...+100/3^100<3/4

chung minh rang 1/3-2/3^2+3/3^3-4/3^4+....+99/3^99-100/3^100<3/16

chung minh rang 1/3 -1 /3^2 + 3/3^3 -4/3^4+...+99/3^99-100/3^100 < 3/16

chung minh 1/3-2/3^2+3/3^3-4/3^4+...+99/3^99-100/3^100<3/16

cho n=1/3-2/3^2+3/3^3-4/3^4+...+99/3^99-100/3^100 . Chung minh n < 3/16

chung minh rang

1/3 + 2/3^2 + ... + 100/3^100<3/4

cho E=(1/3)+(2/3^2)+...+(100/3^100)Chung minh E<(3/4)

chung minh rằng:

1/3 + 2/3² + 3/3³+  4/3⁴ +........+100/3¹⁰⁰  <3/4

    A=3+3^1+3^2+3^3 +3^4+..........+3^100

chung to A   khong chia het cho 13

 gup toi voi !