Question

e, 13 + 23 + 33 + 43 + 53

Answer 1

e,1³ + 2³ + 3³ + 4³ + 5³

Áp dụng công thức: 1³ + 2³ + 3³ +...+ n³  = \(\left(\dfrac{n\left(n+1\right)}{2}\right)^2\)

ta có: 1³ + 2³ + 3³ + 4³ + 5³ = \(\left(\dfrac{5.\left(1+5\right)}{2}\right)^2\) = 15² = 225

= 

Answer 2

225

Answer 3

1³ + 2³ + 3³  + 4³  + 5 ³

=1+8+27+64+125

= 225

 

Answer 4