Question

D=1+1/2(1+2)+1/3(1+2+3)+1/4(1+2+3+4)+...+1/2016(1+2+...+2016)

Answer 1

mn đừng trả lời

Answer 2

\(D=1+\frac{1}{2}\left(1+2\right)+\frac{1}{3}\left(1+2+3\right)+....+\frac{1}{2016}\left(1+2+...+2016\right)\)

\(D=1+\frac{\frac{1}{2}.2.3}{2}+....+\frac{\frac{1}{2016}.2016.2017}{2}=\frac{2+3+....+2017}{2}=....\left(tự\right)tính\)

Answer 3

Làm tất luôn hộ mình đi bạn

Answer 4

ng ta giúp cho rồi tự tinh ¿¿