13 + 23 + 33 + 43 + 53 = 1 + 8 + 27 + 64 + 125
= 225
( 1 + 2 + 3 + 4 + 5 )2 = 152 = 225
\(\Rightarrow\)13 + 23 + 33 + 43 + 53 = ( 1 + 2 + 3 + 4 + 5 )2
Hk tốt
Trả lời :
13+23+33+43+53 =225
(1+2+3+4+5)2=225
Vậy 13+23+33+43+53=(1+2+3+4+5)2
Hok_Tốt
#Thiên_Hy