Question

Tính dãy số sau:

A=1+4+9+16+...+2500

 

Answer 1

minh @gmail.com.vn

nha

Answer 2

quy luật là 3;5;7;9;... đúng ko nhỉ

Answer 3

2500+16+9+4+1=2530

2530:2=1265

             đ/s:1265

Answer 4

A=1+4+9+16+...+2500

1x1+2x2+3x3+4x4+.....+10x10x25

1x2x3x4......x10x10x25+1x2x3x4x.....x10x10x25

1x2x3x4x....10x25x2

=142500