Question

1+4+9+16+.........+100=

Answer 1

Ta có :

1 + 4 + 9 + 16 + 25 + 36 + 49 + 64 + 81 + 100

= ( 81 + 9 ) + ( 16 + 64 ) + ( 49 + 1 ) + ( 4 + 36 ) + 1 + 100

= 90 + 80 + 50 + 40 + 1 + 100

= 361

Answer 2

1 + 4 + 9 + 16 + 25 + 36 + 49 + 64 + 81 +  100 = 295

Answer 3

tổng 385 mới đúng