由题意得出:
13=1=12;
13+23=9=32;
13+23+33=36=62;
13+23+33+43=100=102;
13+23+33+43+53=225=152.
…
则13+23+33+…+n3=(1+2+3+…+n)2=[
n(n+1)
2]2;
故答案为:[
n(n+1)
2]2.
由题意得出:
13=1=12;
13+23=9=32;
13+23+33=36=62;
13+23+33+43=100=102;
13+23+33+43+53=225=152.
…
则13+23+33+…+n3=(1+2+3+…+n)2=[
n(n+1)
2]2;
故答案为:[
n(n+1)
2]2.