Question

1+3+5+7+9+11+13+15+17+19+20=?

Answer 1

1+3+5+7+9+11+13+15+17+19+20=

(1+19)+(3+17)+(5+15)+(7+13)+20=

20      +20      +20     + 20     +20=100

Answer 2

=120 nha bạn

Answer 3

1+3+5+7+9+11+13+15+17+19+20

=(1+19)+(3+17)+(5+15)+(7+13)+(9+11)+20

=20+20+20+20+20+20

=20*6

=120

Answer 4

bạn Trần Thị Khánh Huyền tính sai rui 120 mới đúng

Answer 5

1+3+5+7+9+11+13+15+17+19+20=120

Answer 6

=1+19+(3+17)+(5+15)+(7+13)+(9+11)+20

=20.  +.   20.   +.   20.  +.  20.   +. 20.   + 20

= 40.              +.              40.       +.          40

= 120

Answer 7

=120 nha bạn